diff --git a/firmware/main.c b/firmware/main.c
index 69a9249..dcfe79e 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -1,7 +1,6 @@
 #include <inttypes.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
-#define __DELAY_BACKWARD_COMPATIBLE__
 #include <util/delay.h>
 #include <stdlib.h>
 
diff --git a/fw_test/main.c b/fw_test/main.c
index e3ea38a..5b3f951 100644
--- a/fw_test/main.c
+++ b/fw_test/main.c
@@ -1,7 +1,6 @@
 #include <inttypes.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
-#define __DELAY_BACKWARD_COMPATIBLE__
 #include <util/delay.h>
 #include <stdlib.h>