diff --git a/src/main/java/com/alibaba/druid/sql/SQLUtils.java b/src/main/java/com/alibaba/druid/sql/SQLUtils.java
index cd4e537a2d..e819ae1c11 100644
--- a/src/main/java/com/alibaba/druid/sql/SQLUtils.java
+++ b/src/main/java/com/alibaba/druid/sql/SQLUtils.java
@@ -255,7 +255,7 @@ public class SQLUtils {
             List<SQLStatement> statementList = parser.parseStatementList();
             return toSQLString(statementList, dbType, parameters, option);
         } catch (ClassCastException ex) {
-            LOG.warn("format error", ex);
+            LOG.warn("format error, dbType : " + dbType, ex);
             return sql;
         } catch (ParserException ex) {
             LOG.warn("format error", ex);