diff --git a/core/java/android/app/Fragment.java b/core/java/android/app/Fragment.java
index aafb3c638a655..6870bbff48c70 100644
--- a/core/java/android/app/Fragment.java
+++ b/core/java/android/app/Fragment.java
@@ -2509,6 +2509,7 @@ public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListene
             throw new SuperNotCalledException("Fragment " + this
                     + " did not call through to super.onDestroy()");
         }
+        mChildFragmentManager = null;
     }
 
     private static Transition loadTransition(Context context, TypedArray typedArray,