diff --git a/Makefile.avr b/Makefile.avr
index 611776f..a9011df 100644
--- a/Makefile.avr
+++ b/Makefile.avr
@@ -12,7 +12,7 @@ LDFLAGS += -mmcu=$(MCU)
 AVDFLAGS += -p $(MCU)
 AVDFLAGS += -c usbtiny
 
-FUSES += -U lfuse:w:0x7f:m
+FUSES += -U lfuse:w:0xff:m
 FUSES += -U hfuse:w:0xd9:m
 FUSES += -U efuse:w:0xff:m
 
diff --git a/avr.c b/avr.c
index 661d130..e88c250 100644
--- a/avr.c
+++ b/avr.c
@@ -20,7 +20,7 @@ ISR(TIM0_OVF_vect)
 	
 	m += (256 * 64);
 	if (m >= JIFFY_uS) {
-		m %= JIFFY_uS;
+		m -= JIFFY_uS;
 		tick = true;
 		jiffies += 1;
 	}
diff --git a/avr.h b/avr.h
index 3031cae..12da855 100644
--- a/avr.h
+++ b/avr.h
@@ -5,7 +5,6 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 
-
 // Make sure JIFFY_uS is going to be an integer and not a float!
 #define JIFFIES_PER_SECOND 100
 #define JIFFY_uS (1000000 / JIFFIES_PER_SECOND)
diff --git a/main.c b/main.c
index 8f867b8..34e73ca 100644
--- a/main.c
+++ b/main.c
@@ -241,17 +241,16 @@ void
 loop()
 {
 	uint32_t i;
-	
 
 	if (tick) {
 		tick = false;
 		
 		update_controller();
 
+		if (jiffies % 66 == 0) {
+			PORTB ^= 0xff;
+		}
 		if (jiffies % (JIFFIES_PER_SECOND / 10) == 0) {
-			if (jiffies % JIFFIES_PER_SECOND == 0) {
-				PORTB ^= 0xff;
-			}
 			switch (state) {
 			case SETUP:
 				break;