diff --git a/src/core/lv_obj_style.c b/src/core/lv_obj_style.c
index 86016c4154..bfc2f99f6a 100644
--- a/src/core/lv_obj_style.c
+++ b/src/core/lv_obj_style.c
@@ -73,7 +73,7 @@ void _lv_obj_style_init(void)
     _lv_ll_init(&LV_GC_ROOT(_lv_obj_style_trans_ll), sizeof(trans_t));
 }
 
-void lv_obj_add_style(lv_obj_t * obj, lv_style_t * style, lv_style_selector_t selector)
+void lv_obj_add_style(lv_obj_t * obj, const lv_style_t * style, lv_style_selector_t selector)
 {
     trans_del(obj, selector, LV_STYLE_PROP_ANY, NULL);
 
@@ -103,7 +103,7 @@ void lv_obj_add_style(lv_obj_t * obj, lv_style_t * style, lv_style_selector_t se
     lv_obj_refresh_style(obj, selector, LV_STYLE_PROP_ANY);
 }
 
-void lv_obj_remove_style(lv_obj_t * obj, lv_style_t * style, lv_style_selector_t selector)
+void lv_obj_remove_style(lv_obj_t * obj, const lv_style_t * style, lv_style_selector_t selector)
 {
     lv_state_t state = lv_obj_style_get_selector_state(selector);
     lv_part_t part = lv_obj_style_get_selector_part(selector);
diff --git a/src/core/lv_obj_style.h b/src/core/lv_obj_style.h
index 5d122ca620..a350743e13 100644
--- a/src/core/lv_obj_style.h
+++ b/src/core/lv_obj_style.h
@@ -72,7 +72,7 @@ void _lv_obj_style_init(void);
  * @example         lv_obj_add_style(btn, &style_btn, 0); //Default button style
  * @example         lv_obj_add_style(btn, &btn_red, LV_STATE_PRESSED); //Overwrite only some colors to red when pressed
  */
-void lv_obj_add_style(struct _lv_obj_t * obj, lv_style_t * style, lv_style_selector_t selector);
+void lv_obj_add_style(struct _lv_obj_t * obj, const lv_style_t * style, lv_style_selector_t selector);
 
 /**
  * Add a style to an object.
@@ -83,7 +83,7 @@ void lv_obj_add_style(struct _lv_obj_t * obj, lv_style_t * style, lv_style_selec
  * @example lv_obj_remove_style(obj, NULL, LV_PART_MAIN | LV_STATE_ANY); //Remove all styles from the main part
  * @example lv_obj_remove_style(obj, NULL, LV_PART_ANY | LV_STATE_ANY); //Remove all styles
  */
-void lv_obj_remove_style(struct _lv_obj_t * obj, lv_style_t * style, lv_style_selector_t selector);
+void lv_obj_remove_style(struct _lv_obj_t * obj, const lv_style_t * style, lv_style_selector_t selector);
 
 /**
  * Remove all styles from an object