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 94102c23c9..200167b826 100644
--- a/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java
+++ b/src/main/java/com/alibaba/druid/pool/vendor/MSSQLValidConnectionChecker.java
@@ -23,6 +23,7 @@ import java.sql.Statement;
 import com.alibaba.druid.pool.ValidConnectionChecker;
 import com.alibaba.druid.pool.ValidConnectionCheckerAdapter;
 import com.alibaba.druid.util.JdbcUtils;
+import com.alibaba.druid.util.StringUtils;
 
 /**
  * A MSSQLValidConnectionChecker.
@@ -30,6 +31,7 @@ import com.alibaba.druid.util.JdbcUtils;
 public class MSSQLValidConnectionChecker extends ValidConnectionCheckerAdapter implements ValidConnectionChecker, Serializable {
 
     private static final long serialVersionUID = 1L;
+    private static final String DEFAULT_VALIDATION_QUERY = "SELECT 1";
 
     public MSSQLValidConnectionChecker(){
 
@@ -40,6 +42,10 @@ public class MSSQLValidConnectionChecker extends ValidConnectionCheckerAdapter i
             return false;
         }
 
+        if(StringUtils.isEmpty(validateQuery)) {
+            validateQuery = DEFAULT_VALIDATION_QUERY;
+        }
+
         Statement stmt = null;
 
         try {