diff --git a/SDWebImage/SDWebImageDefine.m b/SDWebImage/SDWebImageDefine.m
index d339020a..254d5aa5 100644
--- a/SDWebImage/SDWebImageDefine.m
+++ b/SDWebImage/SDWebImageDefine.m
@@ -98,6 +98,7 @@ inline UIImage * _Nullable SDScaledImageForScaleFactor(CGFloat scale, UIImage *
         if (bitmapImageRep) {
             NSSize size = NSMakeSize(image.size.width / scale, image.size.height / scale);
             animatedImage = [[NSImage alloc] initWithSize:size];
+            bitmapImageRep.size = size;
             [animatedImage addRepresentation:bitmapImageRep];
         }
 #endif