--- a/image/imgLoader.h
+++ b/image/imgLoader.h
@@ -322,17 +322,17 @@ public:
    * moment only "image/svg+xml" falls into this category, but there may be more
    * in the future.) Callers which want this function to return true for such
    * MIME types should pass AcceptedMimeTypes::IMAGES_AND_DOCUMENTS for
    * @aAccept.
    *
    * @param aMimeType The MIME type to evaluate.
    * @param aAcceptedMimeTypes Which kinds of MIME types to treat as images.
    */
-  static NS_EXPORT_(bool)
+  static bool
   SupportImageWithMimeType(const char* aMimeType,
                            AcceptedMimeTypes aAccept =
                              AcceptedMimeTypes::IMAGES);
 
   static void GlobalInit(); // for use by the factory
   static void Shutdown(); // for use by the factory
 
   nsresult ClearChromeImageCache();