diff --git a/avr.h b/avr.h
index ac611f0..3031cae 100644
--- a/avr.h
+++ b/avr.h
@@ -8,7 +8,7 @@
 
 // Make sure JIFFY_uS is going to be an integer and not a float!
 #define JIFFIES_PER_SECOND 100
-#define JIFFY_uS (10000000 / JIFFIES_PER_SECOND)
+#define JIFFY_uS (1000000 / JIFFIES_PER_SECOND)
 
 #define bit(pin, bit, on) pin = (on ? (pin | bit) : (pin & ~bit))
 
diff --git a/main.c b/main.c
index de16dc4..8f867b8 100644
--- a/main.c
+++ b/main.c
@@ -249,7 +249,9 @@ loop()
 		update_controller();
 
 		if (jiffies % (JIFFIES_PER_SECOND / 10) == 0) {
-		PORTB ^= 0xff;
+			if (jiffies % JIFFIES_PER_SECOND == 0) {
+				PORTB ^= 0xff;
+			}
 			switch (state) {
 			case SETUP:
 				break;