diff --git a/code/main.c b/code/main.c
index fefc515..9ab4702 100644
--- a/code/main.c
+++ b/code/main.c
@@ -148,7 +148,7 @@ uint8_t extract_digit(uint32_t value, uint8_t digit_num);
 ISR(TIMER1_OVF_vect)
 {
 	cli();
-	++ms;
+	ms += 8;
 	sei();
 }
 
@@ -477,8 +477,8 @@ void simple_init()
 	PORTB = (1 << 1) | (1 << 3) | (1 << 4);
 #endif
 
-	// Prescaler 4 (1 MHz / 256 / 4 ~ 1000)
-	TCCR1 = (1 << CS11) | (1 << CS10);
+	// Prescaler 32 (1MHz / 32 / 256 = 8,192 ms)
+	TCCR1 = (1 << CS12) | (1 << CS11);
 
 	// Enable Interrupt on overflow
 	TIMSK = (1 << TOIE1);