diff --git a/src/bin/cargo-fixit/fixit.rs b/src/bin/cargo-fixit/fixit.rs
index e178fa1..17ae5eb 100644
--- a/src/bin/cargo-fixit/fixit.rs
+++ b/src/bin/cargo-fixit/fixit.rs
@@ -6,12 +6,11 @@ use std::{
     process::Stdio,
 };
 
-use cargo_fixit::{shell, CargoResult, CheckFlags};
+use cargo_fixit::{shell, CargoResult, CheckFlags, CheckMessage, Target};
 use cargo_util::paths;
 use clap::Parser;
 use indexmap::{IndexMap, IndexSet};
-use rustfix::{collect_suggestions, diagnostics::Diagnostic, CodeFix};
-use serde::Deserialize;
+use rustfix::{collect_suggestions, CodeFix};
 use tracing::{trace, warn};
 
 #[derive(Debug, Parser)]
@@ -34,12 +33,6 @@ impl FixitArgs {
     }
 }
 
-#[derive(Deserialize)]
-struct CheckMessage {
-    message: Diagnostic,
-    package_id: String,
-}
-
 #[derive(Debug, Default)]
 struct File {
     fixes: u32,
@@ -59,20 +52,19 @@ fn exec(args: FixitArgs) -> CargoResult<()> {
 
     let mut last_errors;
 
-    let mut current_package_id = None;
+    let mut current_target = None;
     let mut seen = HashSet::new();
 
     loop {
-        let (errors, made_changes) =
-            run_rustfix(&args, &mut files, &mut current_package_id, &seen)?;
+        let (errors, made_changes) = run_rustfix(&args, &mut files, &mut current_target, &seen)?;
 
         last_errors = errors;
         iteration += 1;
 
         if !made_changes || iteration >= max_iterations {
-            if let Some(pkg) = current_package_id {
+            if let Some(pkg) = current_target {
                 seen.insert(pkg);
-                current_package_id = None;
+                current_target = None;
                 iteration = 0;
             } else {
                 break;
@@ -93,8 +85,8 @@ fn exec(args: FixitArgs) -> CargoResult<()> {
 fn run_rustfix(
     args: &FixitArgs,
     files: &mut IndexMap<String, File>,
-    current_package_id: &mut Option<String>,
-    seen: &HashSet<String>,
+    current_target: &mut Option<(Target, String)>,
+    seen: &HashSet<(Target, String)>,
 ) -> CargoResult<(IndexSet<String>, bool)> {
     let only = HashSet::new();
     let mut file_map = IndexMap::new();
@@ -113,6 +105,7 @@ fn run_rustfix(
 
     for line in buf.lines() {
         let Ok(CheckMessage {
+            target,
             message: diagnostic,
             package_id,
         }) = serde_json::from_str(&line?)
@@ -165,7 +158,9 @@ fn run_rustfix(
             }
         }
 
-        if seen.contains(&package_id) {
+        let target = (target.clone(), package_id.clone());
+
+        if seen.contains(&target) {
             trace!(
                 "rejecting package id `{}` already seen: {:?}",
                 package_id,
@@ -177,9 +172,9 @@ fn run_rustfix(
             continue;
         }
 
-        let current_package_id = current_package_id.get_or_insert(package_id.clone());
+        let current_target = current_target.get_or_insert(target.clone());
 
-        if current_package_id == &package_id {
+        if current_target == &target {
             file_map
                 .entry(file_name)
                 .or_insert_with(IndexSet::new)
diff --git a/src/check.rs b/src/check.rs
index a16c13f..70c02db 100644
--- a/src/check.rs
+++ b/src/check.rs
@@ -1,160 +1,53 @@
-use clap::Parser;
-
-#[derive(Debug, Parser)]
-pub struct CheckFlags {
-    /// Package(s) to fix
-    #[arg(long, value_name = "SPEC", help_heading = "Package Selection")]
-    package: Vec<String>,
-
-    /// Fix all packages in the workspace
-    #[arg(long, help_heading = "Package Selection")]
-    workspace: bool,
-
-    /// Exclude packages from the fixes
-    #[arg(long, value_name = "SPEC", help_heading = "Package Selection")]
-    exclude: Vec<String>,
-
-    /// Alias for --workspace (deprecated)
-    #[arg(long, help_heading = "Package Selection")]
-    all: bool,
-
-    /// Fix only this package's library
-    #[arg(long, help_heading = "Target Selection")]
-    lib: bool,
-
-    /// Fix all binaries
-    #[arg(long, help_heading = "Target Selection")]
-    bins: bool,
-
-    /// Fix only the specified binary
-    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
-    bin: Option<String>,
-
-    /// Fix all examples
-    #[arg(long, help_heading = "Target Selection")]
-    examples: bool,
-
-    /// Fix only the specified binary
-    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
-    example: Option<String>,
-
-    /// Fix all tests
-    #[arg(long, help_heading = "Target Selection")]
-    tests: bool,
-
-    /// Fix only the specified test
-    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
-    test: Option<String>,
-
-    /// Fix all benches
-    #[arg(long, help_heading = "Target Selection")]
-    benches: bool,
-
-    /// Fix only the specified bench
-    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
-    bench: Option<String>,
-
-    /// Fix all targets
-    #[arg(long, help_heading = "Target Selection")]
-    all_targets: bool,
-
-    /// Space or comma separated list of features to activate
-    #[arg(
-        short = 'F',
-        long,
-        value_name = "FEATURES",
-        help_heading = "Feature Selection"
-    )]
-    features: Vec<String>,
-
-    /// Activate all available features
-    #[arg(long, help_heading = "Feature Selection")]
-    all_features: bool,
-
-    /// Do not activate the `default` feature
-    #[arg(long, help_heading = "Feature Selection")]
-    no_default_features: bool,
-
-    /// Unstable (nightly-only) flags
-    #[arg(short = 'Z', value_name = "FLAG")]
-    unstable_flags: Vec<String>,
+use rustfix::diagnostics::Diagnostic;
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+pub struct CheckMessage {
+    pub target: Target,
+    pub message: Diagnostic,
+    pub package_id: String,
 }
 
-impl CheckFlags {
-    pub fn to_flags(&self) -> Vec<String> {
-        let mut out = Vec::new();
-
-        for spec in self.package.clone() {
-            out.push("--package".to_owned());
-            out.push(spec);
-        }
-        if self.workspace {
-            out.push("--workspace".to_owned());
-        }
-        for spec in self.exclude.clone() {
-            out.push("--exclude".to_owned());
-            out.push(spec);
-        }
-        if self.all {
-            out.push("--all".to_owned());
-        }
-
-        if self.lib {
-            out.push("--lib".to_owned());
-        }
-
-        if self.bins {
-            out.push("--bins".to_owned());
-        }
-        if let Some(b) = self.bin.clone() {
-            out.push("--bin".to_owned());
-            out.push(b);
-        }
-
-        if self.examples {
-            out.push("--examples".to_owned());
-        }
-        if let Some(b) = self.example.clone() {
-            out.push("--example".to_owned());
-            out.push(b);
-        }
-
-        if self.tests {
-            out.push("--tests".to_owned());
-        }
-        if let Some(b) = self.test.clone() {
-            out.push("--test".to_owned());
-            out.push(b);
-        }
-
-        if self.benches {
-            out.push("--benches".to_owned());
-        }
-        if let Some(b) = self.bench.clone() {
-            out.push("--bench".to_owned());
-            out.push(b);
-        }
-
-        if self.all_targets {
-            out.push("--all-targets".to_owned());
-        }
-
-        for i in self.features.clone() {
-            out.push("--features".to_owned());
-            out.push(i);
-        }
-        if self.all_features {
-            out.push("--all-features".to_owned());
-        }
-        if self.no_default_features {
-            out.push("--no-default-features".to_owned());
-        }
+#[derive(Deserialize, Hash, PartialEq, Clone, Eq)]
+pub struct Target {
+    kind: Vec<Kind>,
+    crate_types: Vec<CrateType>,
+    name: String,
+    src_path: String,
+    edition: String,
+    doc: bool,
+    doctest: bool,
+    test: bool,
+}
 
-        for i in self.unstable_flags.clone() {
-            out.push("-Z".to_owned());
-            out.push(i);
-        }
+#[derive(Deserialize, Hash, PartialEq, Clone, Eq)]
+#[serde(rename_all(deserialize = "kebab-case"))]
+pub enum Kind {
+    Bin,
+    Example,
+    Test,
+    Bench,
+    CustomBuild,
+    Lib,
+    Rlib,
+    Dylib,
+    Cdylib,
+    Staticlib,
+    ProcMacro,
+    #[serde(untagged)]
+    Other(String),
+}
 
-        out
-    }
+#[derive(Deserialize, Hash, PartialEq, Clone, Eq)]
+#[serde(rename_all(deserialize = "kebab-case"))]
+pub enum CrateType {
+    Bin,
+    Lib,
+    Rlib,
+    Dylib,
+    Cdylib,
+    Staticlib,
+    ProcMacro,
+    #[serde(untagged)]
+    Other(String),
 }
diff --git a/src/flags.rs b/src/flags.rs
new file mode 100644
index 0000000..a16c13f
--- /dev/null
+++ b/src/flags.rs
@@ -0,0 +1,160 @@
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+pub struct CheckFlags {
+    /// Package(s) to fix
+    #[arg(long, value_name = "SPEC", help_heading = "Package Selection")]
+    package: Vec<String>,
+
+    /// Fix all packages in the workspace
+    #[arg(long, help_heading = "Package Selection")]
+    workspace: bool,
+
+    /// Exclude packages from the fixes
+    #[arg(long, value_name = "SPEC", help_heading = "Package Selection")]
+    exclude: Vec<String>,
+
+    /// Alias for --workspace (deprecated)
+    #[arg(long, help_heading = "Package Selection")]
+    all: bool,
+
+    /// Fix only this package's library
+    #[arg(long, help_heading = "Target Selection")]
+    lib: bool,
+
+    /// Fix all binaries
+    #[arg(long, help_heading = "Target Selection")]
+    bins: bool,
+
+    /// Fix only the specified binary
+    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
+    bin: Option<String>,
+
+    /// Fix all examples
+    #[arg(long, help_heading = "Target Selection")]
+    examples: bool,
+
+    /// Fix only the specified binary
+    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
+    example: Option<String>,
+
+    /// Fix all tests
+    #[arg(long, help_heading = "Target Selection")]
+    tests: bool,
+
+    /// Fix only the specified test
+    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
+    test: Option<String>,
+
+    /// Fix all benches
+    #[arg(long, help_heading = "Target Selection")]
+    benches: bool,
+
+    /// Fix only the specified bench
+    #[arg(long, value_name = "NAME", help_heading = "Target Selection")]
+    bench: Option<String>,
+
+    /// Fix all targets
+    #[arg(long, help_heading = "Target Selection")]
+    all_targets: bool,
+
+    /// Space or comma separated list of features to activate
+    #[arg(
+        short = 'F',
+        long,
+        value_name = "FEATURES",
+        help_heading = "Feature Selection"
+    )]
+    features: Vec<String>,
+
+    /// Activate all available features
+    #[arg(long, help_heading = "Feature Selection")]
+    all_features: bool,
+
+    /// Do not activate the `default` feature
+    #[arg(long, help_heading = "Feature Selection")]
+    no_default_features: bool,
+
+    /// Unstable (nightly-only) flags
+    #[arg(short = 'Z', value_name = "FLAG")]
+    unstable_flags: Vec<String>,
+}
+
+impl CheckFlags {
+    pub fn to_flags(&self) -> Vec<String> {
+        let mut out = Vec::new();
+
+        for spec in self.package.clone() {
+            out.push("--package".to_owned());
+            out.push(spec);
+        }
+        if self.workspace {
+            out.push("--workspace".to_owned());
+        }
+        for spec in self.exclude.clone() {
+            out.push("--exclude".to_owned());
+            out.push(spec);
+        }
+        if self.all {
+            out.push("--all".to_owned());
+        }
+
+        if self.lib {
+            out.push("--lib".to_owned());
+        }
+
+        if self.bins {
+            out.push("--bins".to_owned());
+        }
+        if let Some(b) = self.bin.clone() {
+            out.push("--bin".to_owned());
+            out.push(b);
+        }
+
+        if self.examples {
+            out.push("--examples".to_owned());
+        }
+        if let Some(b) = self.example.clone() {
+            out.push("--example".to_owned());
+            out.push(b);
+        }
+
+        if self.tests {
+            out.push("--tests".to_owned());
+        }
+        if let Some(b) = self.test.clone() {
+            out.push("--test".to_owned());
+            out.push(b);
+        }
+
+        if self.benches {
+            out.push("--benches".to_owned());
+        }
+        if let Some(b) = self.bench.clone() {
+            out.push("--bench".to_owned());
+            out.push(b);
+        }
+
+        if self.all_targets {
+            out.push("--all-targets".to_owned());
+        }
+
+        for i in self.features.clone() {
+            out.push("--features".to_owned());
+            out.push(i);
+        }
+        if self.all_features {
+            out.push("--all-features".to_owned());
+        }
+        if self.no_default_features {
+            out.push("--no-default-features".to_owned());
+        }
+
+        for i in self.unstable_flags.clone() {
+            out.push("-Z".to_owned());
+            out.push(i);
+        }
+
+        out
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 244b29c..e55bd86 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,8 @@
 mod check;
 mod errors;
+mod flags;
 pub mod shell;
 
-pub use check::CheckFlags;
+pub use check::*;
 pub use errors::*;
+pub use flags::CheckFlags;
diff --git a/tests/testsuite/fixit.rs b/tests/testsuite/fixit.rs
index 2cc8d06..e51ab16 100644
--- a/tests/testsuite/fixit.rs
+++ b/tests/testsuite/fixit.rs
@@ -143,3 +143,23 @@ fn dependency_order() {
 "#]])
         .run();
 }
+
+#[cargo_test]
+fn build_unit_order() {
+    let p = project()
+        .file("Cargo.toml", &basic_manifest("foo", "0.1.0"))
+        .file("build.rs", "fn main(){ let mut a = 1; let _ = a; }")
+        .file("src/lib.rs", "fn _a(){ let mut a = 1; let _ = a; }")
+        .file("src/main.rs", "fn main(){ let mut a = 1; let _ = a; }")
+        .build();
+
+    p.cargo_("fixit --allow-no-vcs")
+        .with_status(0)
+        .with_stderr_data(str![[r#"
+[FIXED] build.rs (1 fix)
+[FIXED] src/lib.rs (1 fix)
+[FIXED] src/main.rs (1 fix)
+
+"#]])
+        .run();
+}