diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index 4a94a79..e8b1f67 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -210,7 +210,7 @@
 
                             if (transformedImage && finished) {
                                 BOOL imageWasTransformed = ![transformedImage isEqual:downloadedImage];
-                                [self.imageCache storeImage:transformedImage recalculateFromImage:imageWasTransformed imageData:data forKey:key toDisk:cacheOnDisk];
+                                [self.imageCache storeImage:transformedImage recalculateFromImage:imageWasTransformed imageData:imageWasTransformed ? nil : data forKey:key toDisk:cacheOnDisk];
                             }
 
                             dispatch_main_sync_safe(^{