diff --git a/SDWebImage/Core/SDImageIOAnimatedCoder.m b/SDWebImage/Core/SDImageIOAnimatedCoder.m
index d4d739ec..a7e08c19 100644
--- a/SDWebImage/Core/SDImageIOAnimatedCoder.m
+++ b/SDWebImage/Core/SDImageIOAnimatedCoder.m
@@ -437,14 +437,7 @@ static NSString * kSDCGImageDestinationRequestedFileSize = @"kCGImageDestination
         if (scaleFactor != nil) {
             scale = MAX([scaleFactor doubleValue], 1);
         }
-        CGImageSourceRef imageSource = _imageSource;
-        if (imageSource != NULL) {
-            CFRetain(imageSource);
-        } else {
-            return nil;
-        }
-        image = [self.class createFrameAtIndex:0 source:imageSource scale:scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize options:nil];
-        CFRelease(imageSource);
+        image = [self.class createFrameAtIndex:0 source:_imageSource scale:scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize options:nil];
         if (image) {
             image.sd_imageFormat = self.class.imageFormat;
         }
@@ -657,14 +650,7 @@ static NSString * kSDCGImageDestinationRequestedFileSize = @"kCGImageDestination
         (__bridge NSString *)kCGImageSourceShouldCacheImmediately : @(YES),
         (__bridge NSString *)kCGImageSourceShouldCache : @(YES) // Always cache to reduce CPU usage
     };
-    CGImageSourceRef imageSource = _imageSource;
-    if (imageSource != NULL) {
-        CFRetain(imageSource);
-    } else {
-        return nil;
-    }
-    UIImage *image = [self.class createFrameAtIndex:index source:imageSource scale:_scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize options:options];
-    CFRelease(imageSource);
+    UIImage *image = [self.class createFrameAtIndex:index source:_imageSource scale:_scale preserveAspectRatio:_preserveAspectRatio thumbnailSize:_thumbnailSize options:options];
     if (!image) {
         return nil;
     }