diff --git a/sys/external/bsd/drm/dist/bsd-core/i915_drv.c b/sys/external/bsd/drm/dist/bsd-core/i915_drv.c
index 8363d6a3d13d..d8bbb5aecfda 100644
--- a/sys/external/bsd/drm/dist/bsd-core/i915_drv.c
+++ b/sys/external/bsd/drm/dist/bsd-core/i915_drv.c
@@ -203,8 +203,16 @@ i915drm_attach(device_t parent, device_t self, void *aux)
 	drm_attach(self, pa, i915_pciidlist);
 }
 
+static int
+i915drm_detach(device_t self, int flags)
+{
+	pmf_device_deregister(self);
+
+	return drm_detach(self, flags);
+}
+
 CFATTACH_DECL_NEW(i915drm, sizeof(struct drm_device), i915drm_probe,
-    i915drm_attach, drm_detach, drm_activate);
+    i915drm_attach, i915drm_detach, drm_activate);
 
 #ifdef _MODULE