diff --git a/objects/client.c b/objects/client.c
index 6c4d6743..264a04c4 100644
--- a/objects/client.c
+++ b/objects/client.c
@@ -183,7 +183,7 @@ client_getbyframewin(xcb_window_t w)
 /** Record that a client lost focus.
  * \param c Client being unfocused
  */
-void
+static void
 client_unfocus_update(client_t *c)
 {
     globalconf.client_focus = NULL;
diff --git a/objects/client.h b/objects/client.h
index c67a2407..a7415845 100644
--- a/objects/client.h
+++ b/objects/client.h
@@ -171,7 +171,6 @@ void client_set_skip_taskbar(lua_State *, int, bool);
 void client_focus(client_t *);
 void client_focus_update(client_t *);
 void client_unfocus(client_t *);
-void client_unfocus_update(client_t *);
 bool client_hasproto(client_t *, xcb_atom_t);
 void client_set_focus(client_t *, bool);
 void client_ignore_enterleave_events(void);