diff --git a/SDWebImageDownloader.m b/SDWebImageDownloader.m
index 93c406ff..230f5626 100644
--- a/SDWebImageDownloader.m
+++ b/SDWebImageDownloader.m
@@ -23,7 +23,7 @@
     SDWebImageDownloader *downloader = [[[SDWebImageDownloader alloc] init] autorelease];
     downloader.url = url;
     downloader.delegate = delegate;
-    [downloader start];
+    [downloader performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
     return downloader;
 }