diff --git a/libs/rs/rsContext.cpp b/libs/rs/rsContext.cpp
index 447a7ff88ba21..decd9f1826a95 100644
--- a/libs/rs/rsContext.cpp
+++ b/libs/rs/rsContext.cpp
@@ -442,6 +442,7 @@ void Context::setSurface(uint32_t w, uint32_t h, RsNativeWindow sur) {
 
     if (mWidth && mHeight) {
         mStateVertex.updateSize(this);
+        mFBOCache.updateSize();
     }
 }
 
diff --git a/libs/rs/rsFBOCache.h b/libs/rs/rsFBOCache.h
index f42e1f3a7f55c..5d58ba405416a 100644
--- a/libs/rs/rsFBOCache.h
+++ b/libs/rs/rsFBOCache.h
@@ -38,6 +38,7 @@ public:
     void resetAll(Context *);
 
     void setup(Context *);
+    void updateSize() { mDirty = true; }
 
     struct Hal {
         mutable void *drv;