diff --git a/core/java/android/window/WindowProviderService.java b/core/java/android/window/WindowProviderService.java
index fdc3e5a..f2ae973 100644
--- a/core/java/android/window/WindowProviderService.java
+++ b/core/java/android/window/WindowProviderService.java
@@ -146,7 +146,7 @@
 
     @SuppressLint("OnNameExpected")
     @Override
-    public void onConfigurationChanged(@Nullable Configuration configuration) {
+    public void onConfigurationChanged(@NonNull Configuration configuration) {
         // This is only called from WindowTokenClient.
         mCallbacksController.dispatchConfigurationChanged(configuration);
     }