diff --git a/src/bin/e_widget_radio.c b/src/bin/e_widget_radio.c
index bb5092ff3..7ffbf559c 100644
--- a/src/bin/e_widget_radio.c
+++ b/src/bin/e_widget_radio.c
@@ -39,7 +39,7 @@ e_widget_radio_group_new(int *val)
 }
 
 EAPI Evas_Object *
-e_widget_radio_add(Evas *evas, char *label, int valnum, E_Radio_Group *group)
+e_widget_radio_add(Evas *evas, const char *label, int valnum, E_Radio_Group *group)
 {
    Evas_Object *obj, *o;
    E_Widget_Data *wd;
@@ -82,7 +82,7 @@ e_widget_radio_add(Evas *evas, char *label, int valnum, E_Radio_Group *group)
 }
 
 EAPI Evas_Object *
-e_widget_radio_icon_add(Evas *evas, char *label, char *icon, int icon_w, int icon_h, int valnum, E_Radio_Group *group)
+e_widget_radio_icon_add(Evas *evas, const char *label, const char *icon, int icon_w, int icon_h, int valnum, E_Radio_Group *group)
 {
    Evas_Object *obj, *o, *o2;
    E_Widget_Data *wd;
diff --git a/src/bin/e_widget_radio.h b/src/bin/e_widget_radio.h
index 7a35f49a8..a10ae77f8 100644
--- a/src/bin/e_widget_radio.h
+++ b/src/bin/e_widget_radio.h
@@ -9,8 +9,8 @@
 typedef struct _E_Radio_Group E_Radio_Group;
 
 EAPI E_Radio_Group *e_widget_radio_group_new(int *val);
-EAPI Evas_Object *e_widget_radio_add(Evas *evas, char *label, int valnum, E_Radio_Group *group);
-EAPI Evas_Object *e_widget_radio_icon_add(Evas *evas, char *label, char *icon, int icon_w, int icon_h, int valnum, E_Radio_Group *group);
+EAPI Evas_Object *e_widget_radio_add(Evas *evas, const char *label, int valnum, E_Radio_Group *group);
+EAPI Evas_Object *e_widget_radio_icon_add(Evas *evas, const char *label, const char *icon, int icon_w, int icon_h, int valnum, E_Radio_Group *group);
 EAPI void e_widget_radio_toggle_set(Evas_Object *obj, int toggle);
 
 #endif