diff --git a/packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java b/packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
index 6aa0a4bfd1c78..7d0059f235b85 100644
--- a/packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
+++ b/packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
@@ -388,6 +388,7 @@ public class KeyguardViewManager {
         } else {
             mWindowLayoutParams.flags &= ~WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER;
         }
+        mWindowLayoutParams.format = show ? PixelFormat.TRANSLUCENT : PixelFormat.OPAQUE;
 
         mViewManager.updateViewLayout(mKeyguardHost, mWindowLayoutParams);
     }