diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
index aa4ebb4..1c647e8 100644
--- a/include/media/videobuf-dma-sg.h
+++ b/include/media/videobuf-dma-sg.h
@@ -103,7 +103,8 @@
 			 enum v4l2_buf_type type,
 			 enum v4l2_field field,
 			 unsigned int msize,
-			 void *priv);
+			 void *priv,
+			 struct mutex *ext_lock);
 
 #endif /* _VIDEOBUF_DMA_SG_H */