diff --git a/ext/node/polyfills/internal/util.mjs b/ext/node/polyfills/internal/util.mjs
index 9a5a5b8ec7c1ab..9471975550edf9 100644
--- a/ext/node/polyfills/internal/util.mjs
+++ b/ext/node/polyfills/internal/util.mjs
@@ -10,7 +10,7 @@ import {
 import { ERR_UNKNOWN_SIGNAL } from "ext:deno_node/internal/errors.ts";
 import { os } from "ext:deno_node/internal_binding/constants.ts";
 import { primordials } from "ext:core/mod.js";
-import { isNativeError } from "ext:deno_node/internal/util/types.ts";
+import { isNativeError, isPromise } from "ext:deno_node/internal/util/types.ts";
 
 // deno-lint-ignore prefer-primordials
 const AtomicsWait = Atomics.wait;
@@ -119,7 +119,13 @@ export function promisify(
           resolve(values[0]);
         }
       });
-      ReflectApply(original, this, args);
+      if (isPromise(ReflectApply(original, this, args))) {
+        globalThis.process.emitWarning(
+          "Calling promisify on a function that returns a Promise is likely a mistake.",
+          "DeprecationWarning",
+          "DEP0174",
+        );
+      }
     });
   }
 
diff --git a/tests/node_compat/config.jsonc b/tests/node_compat/config.jsonc
index f2269892f2bfcf..6ea49b9b18863f 100644
--- a/tests/node_compat/config.jsonc
+++ b/tests/node_compat/config.jsonc
@@ -3248,6 +3248,7 @@
     "parallel/test-util-parse-env.js": {},
     "parallel/test-util-primordial-monkeypatching.js": {},
     "parallel/test-util-promisify-custom-names.mjs": {},
+    "parallel/test-util-promisify.js": {},
     "parallel/test-util-stripvtcontrolcharacters.js": {},
     "parallel/test-util-styletext.js": {},
     "parallel/test-util-text-decoder.js": {},