diff --git a/ppl-spark-integration/src/main/antlr4/OpenSearchPPLParser.g4 b/ppl-spark-integration/src/main/antlr4/OpenSearchPPLParser.g4
index d64db1634..9686b0139 100644
--- a/ppl-spark-integration/src/main/antlr4/OpenSearchPPLParser.g4
+++ b/ppl-spark-integration/src/main/antlr4/OpenSearchPPLParser.g4
@@ -510,6 +510,7 @@ evalFunctionName
    | coalesceFunctionName
    | cryptographicFunctionName
    | jsonFunctionName
+   | collectionFunctionName
    ;
 
 functionArgs