diff --git a/src/hal/cpu.h b/src/hal/cpu.h
index a1713a1..ff73d0b 100644
--- a/src/hal/cpu.h
+++ b/src/hal/cpu.h
@@ -6,8 +6,8 @@ namespace hal {
 namespace cpu {
 
 #ifndef F_CPU
-    /// Main clock frequency
-    #define F_CPU (16000000ul)
+/// Main clock frequency
+#define F_CPU (16000000ul)
 #endif
 
 /// CPU init routines (not really necessary for the AVR)