diff --git a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
index 29df85c66b..ec0ce6eaef 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
@@ -1048,7 +1048,10 @@ public class SQLExprParser extends SQLParser {
             }
 
             if (lexer.token == Token.LPAREN) {
-                expr = methodRest(expr, name, false);
+                boolean aggregate = hash_lower == FnvHash.Constants.WM_CONCAT
+                        && expr instanceof SQLIdentifierExpr
+                        && ((SQLIdentifierExpr) expr).nameHashCode64() == FnvHash.Constants.WMSYS;
+                expr = methodRest(expr, name, aggregate);
             } else {
                 expr = new SQLPropertyExpr(expr, name, hash_lower);
             }
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest97_wmsys_wmconat.java b/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest97_wmsys_wmconat.java
new file mode 100644
index 0000000000..5e0d10f4eb
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest97_wmsys_wmconat.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright 1999-2017 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.oracle.select;
+
+import com.alibaba.druid.sql.OracleTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleSchemaStatVisitor;
+import org.junit.Assert;
+
+import java.util.List;
+
+public class OracleSelectTest97_wmsys_wmconat extends OracleTest {
+
+    public void test_0() throws Exception {
+        String sql = //
+                "SELECT NVL(TO_CHAR(WMSYS.WM_CONCAT(NVL(O.CHILD_ITEM_CODE, O.ITEM_CODE))), ?)\n" +
+                        "FROM ECC_CPR.CCG_GTS_OSG3A_V O\n" +
+                        "WHERE O.ENABLED_FLAG = ?\n" +
+                        "\tAND NVL(O.PRICE, ?) = ?\n" +
+                        "\tAND O.CONTRACT_HEADER_ID = :B1"; //
+
+        System.out.println(sql);
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLSelectStatement stmt = (SQLSelectStatement) statementList.get(0);
+        System.out.println(stmt.toString());
+
+        Assert.assertEquals(1, statementList.size());
+
+        SQLMethodInvokeExpr expr = (SQLMethodInvokeExpr) stmt.getSelect().getQueryBlock().getSelectList().get(0).getExpr();
+        SQLMethodInvokeExpr param0 = (SQLMethodInvokeExpr) expr.getParameters().get(0);
+        assertTrue(param0.getParameters().get(0)
+                instanceof SQLAggregateExpr);
+
+        OracleSchemaStatVisitor visitor = new OracleSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        {
+            String text = SQLUtils.toOracleString(stmt);
+
+            assertEquals("SELECT NVL(TO_CHAR(WMSYS.WM_CONCAT(NVL(O.CHILD_ITEM_CODE, O.ITEM_CODE))), ?)\n" +
+                    "FROM ECC_CPR.CCG_GTS_OSG3A_V O\n" +
+                    "WHERE O.ENABLED_FLAG = ?\n" +
+                    "\tAND NVL(O.PRICE, ?) = ?\n" +
+                    "\tAND O.CONTRACT_HEADER_ID = :B1", text);
+        }
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("relationships : " + visitor.getRelationships());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        assertEquals(1, visitor.getTables().size());
+        assertEquals(5, visitor.getColumns().size());
+        assertEquals(2, visitor.getConditions().size());
+        assertEquals(0, visitor.getRelationships().size());
+        assertEquals(0, visitor.getOrderByColumns().size());
+    }
+
+    public void test_1() throws Exception {
+        String sql = //
+                "SELECT NVL(TO_CHAR(WMSYS.WM_CONCAT(NVL(O.CHILD_ITEM_CODE, O.ITEM_CODE))), ?)\n" +
+                        "FROM ECC_CPR.CCG_GTS_OSG3A_V O\n" +
+                        "WHERE O.ENABLED_FLAG = ?\n" +
+                        "\tAND NVL(O.PRICE, ?) = ?\n" +
+                        "\tAND O.CONTRACT_HEADER_ID = :B1"; //
+
+        System.out.println(sql);
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLSelectStatement stmt = (SQLSelectStatement) statementList.get(0);
+        System.out.println(stmt.toString());
+
+        Assert.assertEquals(1, statementList.size());
+
+        SQLBinaryOpExpr expr = (SQLBinaryOpExpr) stmt.getSelect().getQueryBlock().getSelectList().get(0).getExpr();
+        assertTrue(expr.getLeft() instanceof SQLAggregateExpr);
+
+        OracleSchemaStatVisitor visitor = new OracleSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        {
+            String text = SQLUtils.toOracleString(stmt);
+
+            assertEquals("SELECT WMSYS.WM_CONCAT(name) + 1\n" +
+                    "FROM emp", text);
+        }
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("relationships : " + visitor.getRelationships());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        assertEquals(1, visitor.getTables().size());
+        assertEquals(1, visitor.getColumns().size());
+        assertEquals(0, visitor.getConditions().size());
+        assertEquals(0, visitor.getRelationships().size());
+        assertEquals(0, visitor.getOrderByColumns().size());
+    }
+}