diff --git a/libweston/compositor.c b/libweston/compositor.c
index c66193a..c8bcbb0 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -4474,7 +4474,7 @@
  *
  * \internal
  */
-WL_EXPORT void
+static void
 weston_compositor_add_output(struct weston_compositor *compositor,
                              struct weston_output *output)
 {
diff --git a/libweston/compositor.h b/libweston/compositor.h
index 21c4046..e90bfe8 100644
--- a/libweston/compositor.h
+++ b/libweston/compositor.h
@@ -1719,9 +1719,6 @@
 weston_output_move(struct weston_output *output, int x, int y);
 
 void
-weston_compositor_add_output(struct weston_compositor *compositor,
-                             struct weston_output *output);
-void
 weston_output_destroy(struct weston_output *output);
 void
 weston_output_transform_coordinate(struct weston_output *output,