diff --git a/SDWebImage/SDWebImageCompat.m b/SDWebImage/SDWebImageCompat.m
index 8a53754c8..54fb60eb4 100644
--- a/SDWebImage/SDWebImageCompat.m
+++ b/SDWebImage/SDWebImageCompat.m
@@ -30,13 +30,12 @@
         if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
             CGFloat scale = 1.0;
             if (key.length >= 8) {
-                // Search @2x. or @3x. at the end of the string, before a 3 to 4 extension length (only if key len is 8 or more @2x./@3x. + 4 len ext)
-                NSRange range = [key rangeOfString:@"@2x." options:0 range:NSMakeRange(key.length - 8, 5)];
+                NSRange range = [key rangeOfString:@"@2x."];
                 if (range.location != NSNotFound) {
                     scale = 2.0;
                 }
                 
-                range = [key rangeOfString:@"@3x." options:0 range:NSMakeRange(key.length - 8, 5)];
+                range = [key rangeOfString:@"@3x."];
                 if (range.location != NSNotFound) {
                     scale = 3.0;
                 }