diff --git a/Sprinter/Sprinter.h b/Sprinter/Sprinter.h
index 9873843..2a1dd93 100644
--- a/Sprinter/Sprinter.h
+++ b/Sprinter/Sprinter.h
@@ -114,7 +114,6 @@ void plan_buffer_line(float x, float y, float z, float e, float feed_rate);
 void plan_set_position(float x, float y, float z, float e);
 void st_wake_up();
 void st_synchronize();
-void st_set_position(const long &x, const long &y, const long &z, const long &e);
 
 void check_buffer_while_arc();