diff --git a/src/avr_usart.c b/src/avr_usart.c
index f248a86..1f24ea9 100644
--- a/src/avr_usart.c
+++ b/src/avr_usart.c
@@ -64,8 +64,8 @@ int main() {
 void init_usart0(void) {
     //setup stuff for usart communications.
     
-    UBRR0H |= (uint8_t) (BT_UBRR>>8);
-    UBRR0L |= (uint8_t) BT_UBRR;
+    UBRR0H |= (uint8_t) (F_UBRR>>8);
+    UBRR0L |= (uint8_t) F_UBRR;
 
     //Enable recv and Transmit pins, overrides other uses.
     //IN the usart control and status register 0B