diff --git a/tests/gem_exec_flush.c b/tests/gem_exec_flush.c
index 0aa84fe0..a579a788 100644
--- a/tests/gem_exec_flush.c
+++ b/tests/gem_exec_flush.c
@@ -246,6 +246,7 @@ igt_main
 	igt_fixture {
 		igt_require(igt_setup_clflush());
 		fd = drm_open_driver(DRIVER_INTEL);
+		gem_require_mmap_wc(fd);
 		gen = intel_gen(intel_get_drm_devid(fd));
 	}