diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 1b07663..bb1d3fc 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -772,6 +772,8 @@
     mDrawingState.z = z;
     mDrawingState.modified = true;
 
+    mFlinger->mSomeChildrenChanged = true;
+
     // Discard all relative layering.
     if (mDrawingState.zOrderRelativeOf != nullptr) {
         sp<Layer> strongRelative = mDrawingState.zOrderRelativeOf.promote();
@@ -822,6 +824,8 @@
         return false;
     }
 
+    mFlinger->mSomeChildrenChanged = true;
+
     mDrawingState.sequence++;
     mDrawingState.modified = true;
     mDrawingState.z = relativeZ;