diff --git a/Makefile b/Makefile
index 1c6801a..5fc6f17 100644
--- a/Makefile
+++ b/Makefile
@@ -76,5 +76,5 @@ serial:
 endif
 ifeq ($(COM),screen)
 serial:
-        $(COM) $(AVRDUDE_TTY) $(BAUDRATE)
+	$(COM) $(AVRDUDE_TTY) $(BAUDRATE)
 endif