diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index 4cb27b1d9..3f7e97e68 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -3055,6 +3055,8 @@ drm_device_is_kms(struct drm_backend *b, struct udev_device *device)
 	b->drm.id = id;
 	b->drm.filename = strdup(filename);
 
+	drmModeFreeResources(res);
+
 	return true;
 
 out_res: