diff --git a/src/backend/catalog/namespace.c b/src/backend/catalog/namespace.c
index 56b87d878e8..b2daf9adb32 100644
--- a/src/backend/catalog/namespace.c
+++ b/src/backend/catalog/namespace.c
@@ -1625,7 +1625,7 @@ MatchNamedCall(HeapTuple proctup, int nargs, List *argnames,
 	Oid		   *p_argtypes;
 	char	  **p_argnames;
 	char	   *p_argmodes;
-	bool		arggiven[FUNC_MAX_ARGS];
+	bool	   *arggiven;
 	bool		arg_filled_twice = false;
 	bool		isnull;
 	int			ap;				/* call args position */
@@ -1650,8 +1650,8 @@ MatchNamedCall(HeapTuple proctup, int nargs, List *argnames,
 	Assert(include_out_arguments ? (pronargs == pronallargs) : (pronargs <= pronallargs));
 
 	/* initialize state for matching */
-	*argnumbers = (int *) palloc(pronargs * sizeof(int));
-	memset(arggiven, false, pronargs * sizeof(bool));
+	*argnumbers = palloc_array(int, pronargs);
+	arggiven = palloc0_array(bool, pronallargs);
 
 	/* there are numposargs positional args before the named args */
 	for (ap = 0; ap < numposargs; ap++)