diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index 63ed821..a32b31b 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -233,6 +233,8 @@
         return kFalse_FilterReturn;
     }
 
+    SkAutoMaskFreeImage amf(srcM.fImage);
+
     if (!this->filterMask(&patch->fMask, srcM, matrix, &margin)) {
         return kFalse_FilterReturn;
     }