diff --git a/SDWebImage/SDWebImageDownloaderOperation.m b/SDWebImage/SDWebImageDownloaderOperation.m
index c9275ea0..55940280 100644
--- a/SDWebImage/SDWebImageDownloaderOperation.m
+++ b/SDWebImage/SDWebImageDownloaderOperation.m
@@ -181,16 +181,11 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
     }
 
     if (self.dataTask) {
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunguarded-availability"
-        if ([self.dataTask respondsToSelector:@selector(setPriority:)]) {
-            if (self.options & SDWebImageDownloaderHighPriority) {
-                self.dataTask.priority = NSURLSessionTaskPriorityHigh;
-            } else if (self.options & SDWebImageDownloaderLowPriority) {
-                self.dataTask.priority = NSURLSessionTaskPriorityLow;
-            }
+        if (self.options & SDWebImageDownloaderHighPriority) {
+            self.dataTask.priority = NSURLSessionTaskPriorityHigh;
+        } else if (self.options & SDWebImageDownloaderLowPriority) {
+            self.dataTask.priority = NSURLSessionTaskPriorityLow;
         }
-#pragma clang diagnostic pop
         [self.dataTask resume];
         for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
             progressBlock(0, NSURLResponseUnknownLength, self.request.URL);