diff --git a/src/tests/wayland-test-clients/wayland-test-client-utils.c b/src/tests/wayland-test-clients/wayland-test-client-utils.c
index 19ddd2861..c8029cf06 100644
--- a/src/tests/wayland-test-clients/wayland-test-client-utils.c
+++ b/src/tests/wayland-test-clients/wayland-test-client-utils.c
@@ -280,7 +280,7 @@ static const struct wl_buffer_listener buffer_listener = {
   handle_buffer_release
 };
 
-static gboolean
+gboolean
 create_shm_buffer (WaylandDisplay    *display,
                    int                width,
                    int                height,
diff --git a/src/tests/wayland-test-clients/wayland-test-client-utils.h b/src/tests/wayland-test-clients/wayland-test-client-utils.h
index 533846980..dc169cdf4 100644
--- a/src/tests/wayland-test-clients/wayland-test-client-utils.h
+++ b/src/tests/wayland-test-clients/wayland-test-client-utils.h
@@ -40,6 +40,13 @@ int create_anonymous_file (off_t size);
 
 WaylandDisplay * wayland_display_new (WaylandDisplayCapabilities capabilities);
 
+gboolean create_shm_buffer (WaylandDisplay    *display,
+                            int                width,
+                            int                height,
+                            struct wl_buffer **out_buffer,
+                            void             **out_data,
+                            int               *out_size);
+
 void draw_surface (WaylandDisplay    *display,
                    struct wl_surface *surface,
                    int                width,