diff --git a/services/surfaceflinger/SurfaceFlingerConsumer.cpp b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
index ba0a527..e0e4c61 100644
--- a/services/surfaceflinger/SurfaceFlingerConsumer.cpp
+++ b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
@@ -129,6 +129,7 @@
 }
 
 bool SurfaceFlingerConsumer::getTransformToDisplayInverse() const {
+    Mutex::Autolock lock(mMutex);
     return mTransformToDisplayInverse;
 }