diff --git a/sql/src/main/antlr/OpenSearchSQLLexer.g4 b/sql/src/main/antlr/OpenSearchSQLLexer.g4
index 506c51f95b..ba7c5be85a 100644
--- a/sql/src/main/antlr/OpenSearchSQLLexer.g4
+++ b/sql/src/main/antlr/OpenSearchSQLLexer.g4
@@ -106,7 +106,6 @@ UNION:                              'UNION';
 USING:                              'USING';
 WHEN:                               'WHEN';
 WHERE:                              'WHERE';
-WITHIN:                             'WITHIN';
 
 
 // OD SQL special keyword
diff --git a/sql/src/main/antlr/OpenSearchSQLParser.g4 b/sql/src/main/antlr/OpenSearchSQLParser.g4
index 44726c432e..5f7361160b 100644
--- a/sql/src/main/antlr/OpenSearchSQLParser.g4
+++ b/sql/src/main/antlr/OpenSearchSQLParser.g4
@@ -500,7 +500,6 @@ aggregationFunctionName
    | STDDEV
    | STDDEV_POP
    | STDDEV_SAMP
-   | PERCENTILE
    ;
 
 mathematicalFunctionName