diff --git a/ShadowsocksX-NG/Utils.m b/ShadowsocksX-NG/Utils.m
index 62d668f..bb9f452 100644
--- a/ShadowsocksX-NG/Utils.m
+++ b/ShadowsocksX-NG/Utils.m
@@ -61,6 +61,7 @@ void ScanQRCodeOnScreen() {
                 [foundSSUrls addObject:[NSURL URLWithString:feature.messageString]];
             }
         }
+         CGImageRelease(image);
     }
     
     free(displays);