diff --git a/src/bin/e_object.c b/src/bin/e_object.c
index 5a289bc0f..178b2d78a 100644
--- a/src/bin/e_object.c
+++ b/src/bin/e_object.c
@@ -255,10 +255,10 @@ e_object_error(E_Object *obj)
 }
 
 EAPI void
-e_object_data_set(E_Object *obj, void *data)
+e_object_data_set(E_Object *obj, const void *data)
 {
    E_OBJECT_CHECK(obj);
-   obj->data = data;
+   obj->data = (void*)data;
 }
 
 EAPI void *
diff --git a/src/bin/e_object.h b/src/bin/e_object.h
index e2df93a18..8865efaa0 100644
--- a/src/bin/e_object.h
+++ b/src/bin/e_object.h
@@ -88,7 +88,7 @@ EAPI int   e_object_ref                 (E_Object *obj);
 EAPI int   e_object_unref               (E_Object *obj);
 EAPI int   e_object_ref_get             (E_Object *obj);
 EAPI int   e_object_error               (E_Object *obj);
-EAPI void  e_object_data_set            (E_Object *obj, void *data);
+EAPI void  e_object_data_set            (E_Object *obj, const void *data);
 EAPI void *e_object_data_get            (E_Object *obj);
 EAPI void  e_object_free_attach_func_set(E_Object *obj, E_Object_Cleanup_Func func);
 EAPI void  e_object_del_attach_func_set (E_Object *obj, E_Object_Cleanup_Func func);