diff --git a/src/core/SkPictureImageGenerator.h b/src/core/SkPictureImageGenerator.h
index cfb36a3601..aca9c2c169 100644
--- a/src/core/SkPictureImageGenerator.h
+++ b/src/core/SkPictureImageGenerator.h
@@ -4,6 +4,8 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#ifndef SkPictureImageGenerator_DEFINED
+#define SkPictureImageGenerator_DEFINED
 
 #include "SkImageGenerator.h"
 #include "SkTLazy.h"
@@ -33,3 +35,4 @@ private:
 
     typedef SkImageGenerator INHERITED;
 };
+#endif  // SkPictureImageGenerator_DEFINED