diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index d3121a469f..ac4490c0b8 100644
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -2228,6 +2234,9 @@ ExecGrant_generic(InternalGrant *istmt, Oid classid, AclMode default_privs)
 
 		newtuple = heap_modify_tuple(tuple, RelationGetDescr(relation), values,
 									 nulls, replaces);
+		pfree(values);
+		pfree(nulls);
+		pfree(replaces);
 
 		CatalogTupleUpdate(relation, &newtuple->t_self, newtuple);