diff --git a/pkg/dart_internal/analysis_options.yaml b/pkg/dart_internal/analysis_options.yaml
index edcd64e558e..6f7501d9e6b 100644
--- a/pkg/dart_internal/analysis_options.yaml
+++ b/pkg/dart_internal/analysis_options.yaml
@@ -1,5 +1,5 @@
 analyzer:
   errors:
     import_internal_library: ignore
-  strong-mode:
-    implicit-casts: false
+  language:
+    strict-casts: true