diff --git a/core/java/android/widget/PopupWindow.java b/core/java/android/widget/PopupWindow.java
index 8dc8cab..e91db13 100644
--- a/core/java/android/widget/PopupWindow.java
+++ b/core/java/android/widget/PopupWindow.java
@@ -1354,6 +1354,7 @@
         }
 
         mDecorView = createDecorView(mBackgroundView);
+        mDecorView.setIsRootNamespace(true);
 
         // The background owner should be elevated so that it casts a shadow.
         mBackgroundView.setElevation(mElevation);