Index: uspace/lib/wndmgt/src/wndmgt_srv.c
===================================================================
--- uspace/lib/wndmgt/src/wndmgt_srv.c	(revision ffed09d79c4f737ed0a49581161c8c053ce34980)
+++ uspace/lib/wndmgt/src/wndmgt_srv.c	(revision d5f4459ba692b00d99d79ac8d052bbe4cb22265d)
@@ -222,4 +222,22 @@
 }
 
+static void wndmgt_deactivate_window_srv(wndmgt_srv_t *srv, ipc_call_t *icall)
+{
+	sysarg_t dev_id;
+	sysarg_t wnd_id;
+	errno_t rc;
+
+	dev_id = ipc_get_arg1(icall);
+	wnd_id = ipc_get_arg2(icall);
+
+	if (srv->ops->deactivate_window == NULL) {
+		async_answer_0(icall, ENOTSUP);
+		return;
+	}
+
+	rc = srv->ops->deactivate_window(srv->arg, dev_id, wnd_id);
+	async_answer_0(icall, rc);
+}
+
 static void wndmgt_close_window_srv(wndmgt_srv_t *srv, ipc_call_t *icall)
 {
@@ -308,4 +326,7 @@
 		case WNDMGT_ACTIVATE_WINDOW:
 			wndmgt_activate_window_srv(srv, &call);
+			break;
+		case WNDMGT_DEACTIVATE_WINDOW:
+			wndmgt_deactivate_window_srv(srv, &call);
 			break;
 		case WNDMGT_CLOSE_WINDOW: