diff --git a/src/lv_widgets/lv_slider.c b/src/lv_widgets/lv_slider.c
index 2dfff6bb5..87f37fe87 100644
--- a/src/lv_widgets/lv_slider.c
+++ b/src/lv_widgets/lv_slider.c
@@ -59,7 +59,7 @@ static lv_signal_cb_t ancestor_signal;
  *             Pointer to an other slider to copy.
  * @return pointer to the created slider
  */
-lv_obj_t * lv_slider_create(lv_obj_t * parent, lv_obj_t * copy)
+lv_obj_t * lv_slider_create(lv_obj_t * parent, const lv_obj_t * copy)
 {
     LV_LOG_TRACE("slider create started");
 
diff --git a/src/lv_widgets/lv_slider.h b/src/lv_widgets/lv_slider.h
index 07aa657d2..8b5984cd4 100644
--- a/src/lv_widgets/lv_slider.h
+++ b/src/lv_widgets/lv_slider.h
@@ -70,7 +70,7 @@ enum {
  *             Pointer to an other slider to copy.
  * @return pointer to the created slider
  */
-lv_obj_t * lv_slider_create(lv_obj_t * parent, lv_obj_t * copy);
+lv_obj_t * lv_slider_create(lv_obj_t * parent, const lv_obj_t * copy);
 
 /*=====================
  * Setter functions