diff --git a/src/bin/win.c b/src/bin/win.c
index c8491385..9d980d07 100644
--- a/src/bin/win.c
+++ b/src/bin/win.c
@@ -5843,7 +5843,7 @@ term_is_visible(const Term *term)
 }
 
 void
-background_set_shine(Config *config, Evas_Object *bg_edj)
+background_set_shine(const Config *config, Evas_Object *bg_edj)
 {
    Edje_Message_Int msg;
 
diff --git a/src/bin/win.h b/src/bin/win.h
index 33e05991..804190b3 100644
--- a/src/bin/win.h
+++ b/src/bin/win.h
@@ -90,7 +90,7 @@ for_each_term_do(Win *wn, For_Each_Term cb, void *data);
 
 void
 term_apply_shine(Term *term, int shine);
-void background_set_shine(Config *config, Evas_Object *bg);
+void background_set_shine(const Config *config, Evas_Object *bg);
 
 void main_trans_update(void);