diff --git a/ESP-IDF_Robot/main/controls.h b/ESP-IDF_Robot/main/controls.h
index aced79c9b..5cecd25b4 100644
--- a/ESP-IDF_Robot/main/controls.h
+++ b/ESP-IDF_Robot/main/controls.h
@@ -25,7 +25,7 @@ struct motors_rpm {
     int motor4_gpio;
 } Motors;
 
-void motors_init (void);
+static void motors_init (void);
 
 extern Motors *motors;