1 files changed, 5 insertions, 0 deletions
diff --git a/led.h b/led.h
index fd11a87..4f5cc09 100644
--- a/led.h
+++ b/led.h
@@ -1,5 +1,10 @@
+#ifndef LED_H
+#define LED_H
+
 struct colour {
 	unsigned char r, g, b;
 };
 
 void led_signal_sequence(int, struct colour *, int, int, int);
+
+#endif