diff --git a/tests/in/quad.param.ron b/tests/in/quad.param.ron
index aca1da9b93..bb22a33e03 100644
--- a/tests/in/quad.param.ron
+++ b/tests/in/quad.param.ron
@@ -2,6 +2,7 @@
 	spv_version: (1, 0),
 	spv_debug: true,
 	spv_adjust_coordinate_space: true,
+	glsl_custom: true,
 	glsl: (
 		version: Embedded(300),
 		writer_flags: (bits: 0),