diff --git a/right/src/slave_scheduler.h b/right/src/slave_scheduler.h
index 35d4a86..79b7fee 100644
--- a/right/src/slave_scheduler.h
+++ b/right/src/slave_scheduler.h
@@ -29,7 +29,7 @@
 
 // Functions:
 
-    void InitSlaveScheduler();
-    void SetLeds(uint8_t ledBrightness);
+    extern void InitSlaveScheduler();
+    extern void SetLeds(uint8_t ledBrightness);
 
 #endif