diff --git a/lib/src/importer/node_to_dart/async_file.dart b/lib/src/importer/node_to_dart/async_file.dart
index 8fa31c915..ddab82882 100644
--- a/lib/src/importer/node_to_dart/async_file.dart
+++ b/lib/src/importer/node_to_dart/async_file.dart
@@ -30,7 +30,7 @@ class NodeToDartAsyncFileImporter extends AsyncImporter {
   NodeToDartAsyncFileImporter(this._findFileUrl);
 
   FutureOr<Uri?> canonicalize(Uri url) async {
-    if (url.scheme != 'file' && url.scheme != '') return null;
+    if (url.scheme == 'file') return _filesystemImporter.canonicalize(url);
 
     var result = _findFileUrl(
         url.toString(), CanonicalizeOptions(fromImport: fromImport));
diff --git a/lib/src/importer/node_to_dart/file.dart b/lib/src/importer/node_to_dart/file.dart
index 45b66d75c..770b49df9 100644
--- a/lib/src/importer/node_to_dart/file.dart
+++ b/lib/src/importer/node_to_dart/file.dart
@@ -27,7 +27,7 @@ class NodeToDartFileImporter extends Importer {
   NodeToDartFileImporter(this._findFileUrl);
 
   Uri? canonicalize(Uri url) {
-    if (url.scheme != 'file' && url.scheme != '') return null;
+    if (url.scheme == 'file') return _filesystemImporter.canonicalize(url);
 
     var result = _findFileUrl(
         url.toString(), CanonicalizeOptions(fromImport: fromImport));