--- a/meson.build
+++ b/meson.build
@@ -100,7 +100,7 @@
      args : model_quirks)
 
 udev_rules_config = configuration_data()
-udev_rules_config.set('UDEV_TEST_PATH', '')
+udev_rules_config.set('UDEV_TEST_PATH', dir_udev + '/')
 configure_file(input : 'udev/80-libinput-device-groups.rules.in',
 	       output : '80-libinput-device-groups.rules',
 	       install : true,