diff --git a/src/main/java/com/qiniu/util/UrlUtils.java b/src/main/java/com/qiniu/util/UrlUtils.java
index a2892cf8..f5b8e83e 100644
--- a/src/main/java/com/qiniu/util/UrlUtils.java
+++ b/src/main/java/com/qiniu/util/UrlUtils.java
@@ -205,6 +205,6 @@ public static String setHostScheme(String host, boolean useHttps) {
             return host;
         }
 
-        return useHttps ? "https://" : "http://" + host;
+        return (useHttps ? "https://" : "http://") + host;
     }
 }