diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index dd2e58e0b6..52153484f1 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -9463,6 +9463,11 @@ getDefaultACLs(Archive *fout, int *numDefaultACLs)
 						  racl_subquery->data,
 						  initacl_subquery->data,
 						  initracl_subquery->data);
+
+		destroyPQExpBuffer(acl_subquery);
+		destroyPQExpBuffer(racl_subquery);
+		destroyPQExpBuffer(initacl_subquery);
+		destroyPQExpBuffer(initracl_subquery);
 	}
 	else
 	{