diff --git a/pkg/compiler/lib/src/native/enqueue.dart b/pkg/compiler/lib/src/native/enqueue.dart
index d4960d7a042..c79894f9b1c 100644
--- a/pkg/compiler/lib/src/native/enqueue.dart
+++ b/pkg/compiler/lib/src/native/enqueue.dart
@@ -127,9 +127,7 @@ abstract class NativeEnqueuerBase implements NativeEnqueuer {
               _elementEnvironment.getThisType(type.element);
           return _dartTypes.isSubtype(nativeType, specType);
         }));
-      } else if (type.isDynamic ||
-          type.isFunctionTypeVariable ||
-          type is Dart1MethodTypeVariableType) {
+      } else if (type.isDynamic) {
         matchingClasses.addAll(_unusedClasses);
       } else {
         assert(type is VoidType, '$type was ${type.runtimeType}');
diff --git a/sdk/lib/libraries.json b/sdk/lib/libraries.json
index 827b72715b6..82c4ff4f700 100644
--- a/sdk/lib/libraries.json
+++ b/sdk/lib/libraries.json
@@ -217,7 +217,7 @@
         "uri": "html/dart2js/html_dart2js.dart"
       },
       "isolate": {
-        "patches": "_internal/js_runtime/lib/io_patch.dart",
+        "patches": "_internal/js_runtime/lib/isolate_patch.dart",
         "uri": "isolate/isolate.dart"
       },
       "developer": {
diff --git a/sdk/lib/libraries.yaml b/sdk/lib/libraries.yaml
index 6cc356297f3..6c88c970b7d 100644
--- a/sdk/lib/libraries.yaml
+++ b/sdk/lib/libraries.yaml
@@ -181,7 +181,7 @@ dart2js:
 
     isolate:
       uri: "isolate/isolate.dart"
-      patches: "_internal/js_runtime/lib/io_patch.dart"
+      patches: "_internal/js_runtime/lib/isolate_patch.dart"
 
     js:
       uri: "js/dart2js/js_dart2js.dart"