diff --git a/usort/api.py b/usort/api.py
index 329395a..09c0001 100644
--- a/usort/api.py
+++ b/usort/api.py
@@ -103,7 +103,7 @@ def usort_file(path: Path, *, write: bool = False) -> Result:
         data = path.read_bytes()
         result = usort(data, config, path)
 
-        if result.output and write:
+        if result.error is None and write:
             path.write_bytes(result.output)
 
         return result