diff --git a/core/api/current.txt b/core/api/current.txt
index 19caf163ebee8..b4f1a79140ff3 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -10900,7 +10900,7 @@ package android.content {
   }
 
   public static interface SharedPreferences.OnSharedPreferenceChangeListener {
-    method public void onSharedPreferenceChanged(android.content.SharedPreferences, String);
+    method public void onSharedPreferenceChanged(android.content.SharedPreferences, @Nullable String);
   }
 
   public class SyncAdapterType implements android.os.Parcelable {
diff --git a/core/java/android/content/SharedPreferences.java b/core/java/android/content/SharedPreferences.java
index c193868fc3fd5..de6dc22a862e5 100644
--- a/core/java/android/content/SharedPreferences.java
+++ b/core/java/android/content/SharedPreferences.java
@@ -68,7 +68,7 @@ public interface SharedPreferences {
          *            {@link android.os.Build.VERSION_CODES#R Android R} or later, will receive
          *            a {@code null} value when preferences are cleared.
          */
-        void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key);
+        void onSharedPreferenceChanged(SharedPreferences sharedPreferences, @Nullable String key);
     }
 
     /**