diff --git a/src/backend/distributed/deparser/ruleutils_14.c b/src/backend/distributed/deparser/ruleutils_14.c
index bde8e1b23..d1c43d110 100644
--- a/src/backend/distributed/deparser/ruleutils_14.c
+++ b/src/backend/distributed/deparser/ruleutils_14.c
@@ -482,7 +482,7 @@ get_merged_argument_list(CallStmt *stmt, List **mergedNamedArgList,
 	Oid  functionOid = stmt->funcexpr->funcid;
 	List *namedArgList = NIL;
 	List *finalArgumentList = NIL;
-	Oid  finalArgTypes[FUNC_MAX_ARGS];
+	Oid  *finalArgTypes;
 	Oid  *argTypes = NULL;
 	char *argModes = NULL;
 	char **argNames = NULL;
@@ -519,6 +519,7 @@ get_merged_argument_list(CallStmt *stmt, List **mergedNamedArgList,
 
 	/* Remove the duplicate INOUT counting */
 	numberOfArgs = numberOfArgs - totalInoutArgs;
+	finalArgTypes = palloc0(sizeof(Oid) * numberOfArgs);
 
 	ListCell *inArgCell = list_head(stmt->funcexpr->args);
 	ListCell *outArgCell = list_head(stmt->outargs);
diff --git a/src/backend/distributed/deparser/ruleutils_15.c b/src/backend/distributed/deparser/ruleutils_15.c
index 307ad4c6a..c27cce9d7 100644
--- a/src/backend/distributed/deparser/ruleutils_15.c
+++ b/src/backend/distributed/deparser/ruleutils_15.c
@@ -491,7 +491,7 @@ get_merged_argument_list(CallStmt *stmt, List **mergedNamedArgList,
 	Oid  functionOid = stmt->funcexpr->funcid;
 	List *namedArgList = NIL;
 	List *finalArgumentList = NIL;
-	Oid  finalArgTypes[FUNC_MAX_ARGS];
+	Oid  *finalArgTypes;
 	Oid  *argTypes = NULL;
 	char *argModes = NULL;
 	char **argNames = NULL;
@@ -528,6 +528,7 @@ get_merged_argument_list(CallStmt *stmt, List **mergedNamedArgList,
 
 	/* Remove the duplicate INOUT counting */
 	numberOfArgs = numberOfArgs - totalInoutArgs;
+	finalArgTypes = palloc0(sizeof(Oid) * numberOfArgs);
 
 	ListCell *inArgCell = list_head(stmt->funcexpr->args);
 	ListCell *outArgCell = list_head(stmt->outargs);
@@ -610,6 +611,7 @@ get_merged_argument_list(CallStmt *stmt, List **mergedNamedArgList,
 
 	return true;
 }
+
 /*
  * pg_get_rule_expr deparses an expression and returns the result as a string.
  */