diff --git a/ppl/src/main/antlr/OpenSearchPPLLexer.g4 b/ppl/src/main/antlr/OpenSearchPPLLexer.g4
index ea7e060d9cd..c484f34a2a6 100644
--- a/ppl/src/main/antlr/OpenSearchPPLLexer.g4
+++ b/ppl/src/main/antlr/OpenSearchPPLLexer.g4
@@ -202,10 +202,6 @@ FIRST:                              'FIRST';
 LAST:                               'LAST';
 LIST:                               'LIST';
 VALUES:                             'VALUES';
-EARLIEST:                           'EARLIEST';
-EARLIEST_TIME:                      'EARLIEST_TIME';
-LATEST:                             'LATEST';
-LATEST_TIME:                        'LATEST_TIME';
 PER_DAY:                            'PER_DAY';
 PER_HOUR:                           'PER_HOUR';
 PER_MINUTE:                         'PER_MINUTE';
diff --git a/ppl/src/main/antlr/OpenSearchPPLParser.g4 b/ppl/src/main/antlr/OpenSearchPPLParser.g4
index 999c5d9c87c..acae54b7d9d 100644
--- a/ppl/src/main/antlr/OpenSearchPPLParser.g4
+++ b/ppl/src/main/antlr/OpenSearchPPLParser.g4
@@ -951,10 +951,6 @@ keywordsCanBeId
    | LAST
    | LIST
    | VALUES
-   | EARLIEST
-   | EARLIEST_TIME
-   | LATEST
-   | LATEST_TIME
    | PER_DAY
    | PER_HOUR
    | PER_MINUTE