diff --git a/clutter/evdev/clutter-device-manager-evdev.c b/clutter/evdev/clutter-device-manager-evdev.c
index 5b8cfd868..9da5fd499 100644
--- a/clutter/evdev/clutter-device-manager-evdev.c
+++ b/clutter/evdev/clutter-device-manager-evdev.c
@@ -85,9 +85,9 @@ static const gchar *subsystems[] = { "input", NULL };
  */
 
 
-const char *option_xkb_layout = "us";
-const char *option_xkb_variant = "";
-const char *option_xkb_options = "";
+static const char *option_xkb_layout = "us";
+static const char *option_xkb_variant = "";
+static const char *option_xkb_options = "";
 
 /*
  * ClutterEventSource for reading input devices
diff --git a/clutter/wayland/clutter-device-manager-wayland.c b/clutter/wayland/clutter-device-manager-wayland.c
index 75fdf21f1..1282a9f71 100644
--- a/clutter/wayland/clutter-device-manager-wayland.c
+++ b/clutter/wayland/clutter-device-manager-wayland.c
@@ -147,9 +147,9 @@ _clutter_device_manager_wayland_init (ClutterDeviceManagerWayland *self)
 {
 }
 
-const char *option_xkb_layout = "us";
-const char *option_xkb_variant = "";
-const char *option_xkb_options = "";
+static const char *option_xkb_layout = "us";
+static const char *option_xkb_variant = "";
+static const char *option_xkb_options = "";
 
 void
 _clutter_device_manager_wayland_add_input_group (ClutterDeviceManager *manager,