diff --git a/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java b/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java
index 70a20849ae..2552ea5220 100644
--- a/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java
+++ b/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java
@@ -17,7 +17,7 @@ public class MSSQLValidConnectionChecker implements ValidConnectionChecker, Seri
 
     private static final long   serialVersionUID = 1L;
 
-    private static final String QUERY            = "SELECT x";
+    private static final String QUERY            = "SELECT 1";
     private static final Log    LOG              = LogFactory.getLog(MSSQLValidConnectionChecker.class);
 
     public boolean isValidConnection(final Connection c) {