diff --git a/lib/lib_div/A4988_Stepper/src/A4988_Stepper.h b/lib/lib_div/A4988_Stepper/src/A4988_Stepper.h
index a907adfb1..f48041a6a 100644
--- a/lib/lib_div/A4988_Stepper/src/A4988_Stepper.h
+++ b/lib/lib_div/A4988_Stepper/src/A4988_Stepper.h
@@ -34,7 +34,7 @@ class A4988_Stepper {
     void  setRPM  (int   whatRPM     );
     int   getRPM  (void              );
 
-    void  setMIS  (short OneToSixteen);
+    void  setMIS  (short oneToSixteen);
     short getMIS  (void              );
 
     void  setSPR  (int   howMany     );