diff --git a/src/core/plan.c b/src/core/plan.c
index 9b39629..8d7a942 100644
--- a/src/core/plan.c
+++ b/src/core/plan.c
@@ -1,16 +1,39 @@
 #include "core/plan.h"
 
+#include <stddef.h>
+
 #include "base/array.h"
 #include "base/memory.h"
 
+static void free_memory_hold_by_effects(effect_t *effects, size_t count) {
+  for (size_t i = 0; i < count; ++i) {
+    auto effect = &effects[i];
+
+    switch (effect->type) {
+    case ZDWM_EFFECT_CHANGE_WINDOW_LIST:
+      p_delete(&effect->as.change_window_list.windows);
+      break;
+    case ZDWM_EFFECT_RESTACK_WINDOWS:
+      p_delete(&effect->as.restack_windows.windows);
+      break;
+    case ZDWM_EFFECT_BIND_KEY:
+      p_delete(&effect->as.bind_key.keys);
+      break;
+    default:
+    }
+  }
+}
+
 void plan_reset(plan_t *plan) {
   if (!plan->effects || !plan->capacity) return;
 
+  free_memory_hold_by_effects(plan->effects, plan->count);
   p_clear(plan->effects, plan->capacity);
   plan->count = 0;
 }
 
 void plan_cleanup(plan_t *plan) {
+  free_memory_hold_by_effects(plan->effects, plan->count);
   p_delete(&plan->effects);
   plan->count    = 0;
   plan->capacity = 0;