diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7bc60c848940f95d1352ac79b7040867fa6268a3..6c7f8bca574eb4414f9a1d95894a5e10c25882b5 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1736,7 +1736,7 @@ extern struct drm_display_mode *intel_find_panel_downclock(
 int intel_backlight_device_register(struct intel_connector *connector);
 void intel_backlight_device_unregister(struct intel_connector *connector);
 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
-static int intel_backlight_device_register(struct intel_connector *connector)
+static inline int intel_backlight_device_register(struct intel_connector *connector)
 {
 	return 0;
 }