diff --git a/src/components/panes/design.tsx b/src/components/panes/design.tsx
index e0873eae..74899e1f 100644
--- a/src/components/panes/design.tsx
+++ b/src/components/panes/design.tsx
@@ -120,7 +120,7 @@ const makeReaderPromise = (file: File): Promise<[string, string]> => {
     };
     reader.onerror = rej;
     reader.onabort = rej;
-    reader.readAsBinaryString(file);
+    reader.readAsText(file, "UTF-8")
   });
 };