diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 8914fb1ae6eed..7b13e4b1bf6b6 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -327,7 +327,7 @@ public class NotificationPanelView extends PanelView implements
         } else if (!mQsExpanded) {
             setQsExpansion(mQsMinExpansionHeight + mLastOverscroll);
         }
-        mNotificationStackScroller.setStackHeight(getExpandedHeight());
+        updateStackHeight(getExpandedHeight());
         updateHeader();
         mNotificationStackScroller.updateIsSmallScreen(
                 mHeader.getCollapsedHeight() + mQsPeekHeight);
@@ -1457,7 +1457,7 @@ public class NotificationPanelView extends PanelView implements
             setQsExpansion(mQsMinExpansionHeight
                     + t * (getTempQsMaxExpansion() - mQsMinExpansionHeight));
         }
-        mNotificationStackScroller.setStackHeight(expandedHeight);
+        updateStackHeight(expandedHeight);
         updateHeader();
         updateUnlockIcon();
         updateNotificationTranslucency();
@@ -2234,4 +2234,9 @@ public class NotificationPanelView extends PanelView implements
         mScrollView.setTranslationX(translation);
         mHeader.setTranslationX(translation);
     }
+
+    private void updateStackHeight(float stackHeight) {
+        mNotificationStackScroller.setStackHeight(stackHeight);
+        updateKeyguardBottomAreaAlpha();
+    }
 }