diff --git a/components/script/dom/webidls/ImageBitmap.webidl b/components/script/dom/webidls/ImageBitmap.webidl
index d15d96772fd..e2ace645e74 100644
--- a/components/script/dom/webidls/ImageBitmap.webidl
+++ b/components/script/dom/webidls/ImageBitmap.webidl
@@ -21,13 +21,13 @@ typedef (CanvasImageSource or
          Blob or
          ImageData) ImageBitmapSource;
 
-enum ImageOrientation { "none", "flipY" };
+enum ImageOrientation { "from-image", "flipY" };
 enum PremultiplyAlpha { "none", "premultiply", "default" };
 enum ColorSpaceConversion { "none", "default" };
 enum ResizeQuality { "pixelated", "low", "medium", "high" };
 
 dictionary ImageBitmapOptions {
-  ImageOrientation imageOrientation = "none";
+  ImageOrientation imageOrientation = "from-image";
   PremultiplyAlpha premultiplyAlpha = "default";
   ColorSpaceConversion colorSpaceConversion = "default";
   [EnforceRange] unsigned long resizeWidth;