diff --git a/include/effect_clock.h b/include/effect_clock.h
index 770fc40..343e951 100644
--- a/include/effect_clock.h
+++ b/include/effect_clock.h
@@ -10,7 +10,7 @@ protected:
     Window* window = new Window(0, LED_HEIGHT - 6, LED_WIDTH, 6);
 
 public:
-    ~ClockEffect();
+    virtual ~ClockEffect();
     virtual void loop(uint16_t ms);
     String get_name() override { return "clock"; }
     void loop_with_invert(bool invert);
@@ -20,5 +20,6 @@ public:
 class NightClockEffect : public ClockEffect {
 public:
 	NightClockEffect();
+    ~NightClockEffect();
 	void loop(uint16_t ms) override;
 };
diff --git a/src/effect_clock.cpp b/src/effect_clock.cpp
index d34f370..df441aa 100644
--- a/src/effect_clock.cpp
+++ b/src/effect_clock.cpp
@@ -66,3 +66,7 @@ void ClockEffect::loop(boolean invert, CRGB fg_color, CRGB bg_color, uint8_t yPo
 ClockEffect::~ClockEffect() {
 	delete window;
 }
+
+NightClockEffect::~NightClockEffect() {
+	delete window;
+}
\ No newline at end of file