diff --git a/src/main/java/com/alibaba/druid/sql/dialect/db2/parser/DB2ExprParser.java b/src/main/java/com/alibaba/druid/sql/dialect/db2/parser/DB2ExprParser.java
index 86c8d68b51..50bca74eb8 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/db2/parser/DB2ExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/db2/parser/DB2ExprParser.java
@@ -20,7 +20,7 @@ import com.alibaba.druid.sql.parser.SQLExprParser;
 
 public class DB2ExprParser extends SQLExprParser {
 
-    public final static String[] AGGREGATE_FUNCTIONS = { "AVG", "COUNT", "MAX", "MIN", "STDDEV", "SUM", "ROW_NUMBER" };
+    public final static String[] AGGREGATE_FUNCTIONS = { "AVG", "COUNT", "MAX", "MIN", "STDDEV", "SUM", "ROW_NUMBER", "ROWNUMBER" };
 
     public DB2ExprParser(String sql){
         this(new DB2Lexer(sql));