diff --git a/src/hal/adc.cpp b/src/hal/adc.cpp
index 731a486..d0c9696 100644
--- a/src/hal/adc.cpp
+++ b/src/hal/adc.cpp
@@ -6,7 +6,7 @@ namespace adc {
 
 void Init() {
     ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
-	ADMUX |= (1 << REFS0);
+    ADMUX |= (1 << REFS0);
     ADCSRA |= (1 << ADEN);
 }