diff --git a/mie/pass/pass-manager.c b/mie/pass/pass-manager.c
index 15b21f0..3c038a3 100644
--- a/mie/pass/pass-manager.c
+++ b/mie/pass/pass-manager.c
@@ -204,16 +204,17 @@ static void schedule_passes(
 		b_queue_push_back(schedule, &sched->s_entry);
 	}
 
-	struct mie_walker *walker = mie_walker_begin(op, MIE_WALKER_F_INCLUDE_OPS);
-	while (mie_walker_step(walker) == MIE_SUCCESS) {
+	struct mie_walker walker;
+	mie_walker_begin(&walker, op, MIE_WALKER_F_INCLUDE_OPS);
+	do {
 		for (size_t i = 0; i < MIE_VECTOR_COUNT(pm->pm_nested); i++) {
 			struct mie_pass_manager *nested = pm->pm_nested.items[i];
-			struct mie_walk_item *item = mie_walker_get(walker);
+			struct mie_walk_item *item = mie_walker_get(&walker);
 			schedule_passes(nested, schedule, item->i_op, depth + 1);
 		}
-	}
+	} while (mie_walker_step(&walker) == MIE_SUCCESS);
 
-	mie_walker_end(walker);
+	mie_walker_end(&walker);
 }
 
 static void sched_item_execute(