diff --git a/gfx/2d/DrawTargetCG.cpp b/gfx/2d/DrawTargetCG.cpp
index 65eee44199f..eca48d507ec 100644
--- a/gfx/2d/DrawTargetCG.cpp
+++ b/gfx/2d/DrawTargetCG.cpp
@@ -1270,7 +1270,9 @@ DrawTargetCG::Init(BackendType aType,
 void
 DrawTargetCG::Flush()
 {
-  CGContextFlush(mCg);
+  if (GetContextType(mCg) == CG_CONTEXT_TYPE_IOSURFACE) {
+    CGContextFlush(mCg);
+  }
 }
 
 bool