1 files changed, 4 insertions, 1 deletions
diff --git a/dom/canvas/ImageUtils.h b/dom/canvas/ImageUtils.h
index 46b391515c..6b9cd9ca71 100644
--- a/dom/canvas/ImageUtils.h
+++ b/dom/canvas/ImageUtils.h
@@ -13,6 +13,9 @@
 
 namespace mozilla {
 
+template <typename T>
+class Maybe;
+
 namespace layers {
 class Image;
 }
@@ -51,7 +54,7 @@ class ImageUtils {
   explicit ImageUtils(layers::Image* aImage);
   ~ImageUtils();
 
-  ImageBitmapFormat GetFormat() const;
+  Maybe<ImageBitmapFormat> GetFormat() const;
 
   uint32_t GetBufferLength() const;