diff --git a/include/effect_big_clock.h b/include/effect_big_clock.h
index 740b0d8..e61523c 100644
--- a/include/effect_big_clock.h
+++ b/include/effect_big_clock.h
@@ -8,7 +8,7 @@ private:
     CRGB _color_seconds = CRGB(0xFF0000);
 
     void _draw_seconds();
-    void _draw_border_pixel(uint8_t second, CRGB* color);
+    void _draw_border_pixel(uint8_t second, uint8_t part, CRGB* color);
 
 public:
     void loop();
diff --git a/src/effect_big_clock.cpp b/src/effect_big_clock.cpp
index 669a1fe..aa1c7d0 100644
--- a/src/effect_big_clock.cpp
+++ b/src/effect_big_clock.cpp
@@ -25,32 +25,33 @@ void BigClockEffect::loop() {
 void BigClockEffect::_draw_seconds() {
 	uint8_t seconds = ntpClient.getSeconds();
 	for (int i=1; i<=seconds; i++) {
-		_draw_border_pixel(i, &_color_seconds);
+		_draw_border_pixel(i, 0, &_color_seconds);
 	}
 	uint16_t millis = ntpClient.getEpochMillis() % 1000;
 	if (millis > 0) {
-		uint8_t part = 60 - ((60 - seconds) * millis / 1000);
-		_draw_border_pixel(part, &_color_seconds);
+		uint16_t position = ((60 - (60 - seconds) * millis) << 8) / 1000;
+		//uint8_t position = 60 - ((60 - seconds) * millis / 1000);
+		_draw_border_pixel(position>>8, position&0xFF, &_color_seconds);
 	}
 }
 
-void BigClockEffect::_draw_border_pixel(uint8_t i, CRGB* color) {
-	uint8_t x, y;
+void BigClockEffect::_draw_border_pixel(uint8_t i, uint8_t part, CRGB* color) {
+	accum88 x, y;
 	if (i<=8) {
-		x = 7 + i;
+		x = (7 + i)<<8 | part;
 		y = 0;
 	} else if (i<=23) {
-		x = 15;
-		y = i - 8;
+		x = 15 << 8;
+		y = (i - 8) << 8 | (255 - part);
 	} else if (i<= 38) {
-		x = 15 - i + 23;
-		y = 15;
+		x = (15 - i + 23) << 8 | (255 - part);
+		y = 15 << 8;
 	} else if (i <= 53) {
 		x = 0;
-		y = 15 - i + 38;
+		y = (15 - i + 38) << 8 | part;
 	} else {
-		x = i - 53;
+		x = (i - 53) << 8 | part;
 		y = 0;
 	}
-	window->setPixel(x, y, color);
+	window->setSubPixel(x, y, color);
 }