diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index c9ebf99..6955d73 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -518,6 +518,7 @@
                                  const LayerVector::Visitor& visitor);
     void traverseInZOrder(LayerVector::StateSet stateSet, const LayerVector::Visitor& visitor);
 
+    size_t getChildrenCount() const;
     void addChild(const sp<Layer>& layer);
     // Returns index if removed, or negative value otherwise
     // for symmetry with Vector::remove