diff --git a/core/java/android/app/PendingIntent.java b/core/java/android/app/PendingIntent.java
index 9dbf1ff6f7c9f..b8b9d9fc4026d 100644
--- a/core/java/android/app/PendingIntent.java
+++ b/core/java/android/app/PendingIntent.java
@@ -352,7 +352,9 @@ public final class PendingIntent implements Parcelable {
 
         if (Compatibility.isChangeEnabled(PENDING_INTENT_EXPLICIT_MUTABILITY_REQUIRED)
                 && !flagImmutableSet && !flagMutableSet) {
-            Log.e(TAG, msg);
+            Log.wtf(TAG, msg);
+            throw new IllegalArgumentException(
+                "Please specify an explicit mutability flag (FLAG_IMMUTABLE or FLAG_MUTABLE)");
         }
     }