diff --git a/src/core/plan.h b/src/core/plan.h
index 291377f..152b25c 100644
--- a/src/core/plan.h
+++ b/src/core/plan.h
@@ -5,14 +5,6 @@
 
 #include "core/types.h"
 
-typedef uint32_t dirty_mask_t;
-
-typedef enum dirty_flags_t : dirty_mask_t {
-  ZDWM_DIRTY_NONE   = 0,
-  ZDWM_DIRTY_LAYOUT = 1u << 0, /* 需要重新计算布局 */
-  ZDWM_DIRTY_OUTPUT = 1u << 1, /* 当前 output 有变更 */
-} dirty_flags_t;
-
 typedef enum effect_type_t {
   ZDWM_EFFECT_MAP_WINDOW = 1,
   ZDWM_EFFECT_UNMAP_WINDOW,
@@ -74,7 +66,7 @@ typedef struct plan_t {
   effect_t *effects;
   size_t count;
   size_t capacity;
-  dirty_mask_t dirty_flags;
+  bool need_relayout;
 } plan_t;
 
 void plan_reset(plan_t *plan);
diff --git a/src/core/policy.c b/src/core/policy.c
index 0b389f2..17143dd 100644
--- a/src/core/policy.c
+++ b/src/core/policy.c
@@ -131,7 +131,7 @@ static bool manage_window(
   plan_push_effect(plan, &map_effect);
 
   if (window_need_layout(window)) {
-    plan->dirty_flags |= ZDWM_DIRTY_LAYOUT;
+    plan->need_relayout = true;
   }
 
   return true;
@@ -146,11 +146,11 @@ static bool switch_workspace(
   auto workspace_id = command->workspace;
 
   if (state_output_set_current_workspace(state, output_id, workspace_id)) {
-    plan->dirty_flags |= ZDWM_DIRTY_LAYOUT;
+    plan->need_relayout = true;
   }
 
   if (state_set_current_output(state, output_id)) {
-    plan->dirty_flags |= ZDWM_DIRTY_OUTPUT;
+    plan->need_relayout = true;
   }
 
   /* TODO: 后续考虑加上 ewmh 相关副作用 */