diff --git a/src/main/java/org/apache/ibatis/datasource/pooled/PooledDataSource.java b/src/main/java/org/apache/ibatis/datasource/pooled/PooledDataSource.java
index 758b396be79..9bc0c1a2b08 100644
--- a/src/main/java/org/apache/ibatis/datasource/pooled/PooledDataSource.java
+++ b/src/main/java/org/apache/ibatis/datasource/pooled/PooledDataSource.java
@@ -385,7 +385,7 @@ public PoolState getPoolState() {
   }
 
   private int assembleConnectionTypeCode(String url, String username, String password) {
-    return ("" + url + username + password).hashCode();
+    return (url + username + password).hashCode();
   }
 
   protected void pushConnection(PooledConnection conn) throws SQLException {