diff --git a/project/Core/Inc/mug.h b/project/Core/Inc/mug.h
index f2cbbe2..5285f89 100644
--- a/project/Core/Inc/mug.h
+++ b/project/Core/Inc/mug.h
@@ -7,6 +7,6 @@
 #ifndef INC_MUG_H_
 #define INC_MUG_H_
 
-void mug_init();
+void mug_init(void);
 
 #endif /* INC_MUG_H_ */