diff --git a/pmd-plsql/etc/grammar/PldocAST.jjt b/pmd-plsql/etc/grammar/PldocAST.jjt
index ac10a54877..eb72df7414 100644
--- a/pmd-plsql/etc/grammar/PldocAST.jjt
+++ b/pmd-plsql/etc/grammar/PldocAST.jjt
@@ -1644,7 +1644,7 @@ ASTFunctionCall FunctionCall() :
       | LOOKAHEAD({"XMLCAST".equalsIgnoreCase(token.getImage())}) "(" Expression() <AS> Datatype() ")"
       | LOOKAHEAD({"XMLQUERY".equalsIgnoreCase(token.getImage())}) "(" StringLiteral() [ LOOKAHEAD({isKeyword("PASSING")}) XMLPassingClause() ] <RETURNING> KEYWORD("CONTENT") [ <NULL> <ON> <EMPTY> ] ")"
       | LOOKAHEAD({"CAST".equalsIgnoreCase(token.getImage())}) "(" ( <MULTISET> "(" Subquery() ")" | Expression() ) <AS> Datatype() ")"
-      | LOOKAHEAD({"XMLFOREST".equalsIgnoreCase(token.getImage())}) "(" SqlExpression() [ <AS> ] [ ID() ] ( "," SqlExpression() [ <AS> ] [ ID() ] )* ")"
+      | LOOKAHEAD({"XMLFOREST".equalsIgnoreCase(token.getImage())}) "(" SqlExpression() [ [ <AS> ] ID() ] ( "," SqlExpression() [ [ <AS> ] ID() ] )* ")"
       | LOOKAHEAD({"XMLELEMENT".equalsIgnoreCase(token.getImage())}) XMLElement()
       | LOOKAHEAD({"XMLROOT".equalsIgnoreCase(token.getImage())})
              "(" Expression() "," KEYWORD("VERSION") (<NO> KEYWORD("VALUE") | Expression() )