diff --git a/configure.ac b/configure.ac
index 94d54a60..f778a9a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,6 +31,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
 
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
 AM_PATH_PYTHON([3],, [:])
diff --git a/tests/gem_fence_thrash.c b/tests/gem_fence_thrash.c
index 2065ac65..11afba85 100644
--- a/tests/gem_fence_thrash.c
+++ b/tests/gem_fence_thrash.c
@@ -75,6 +75,7 @@ bo_create (int fd)
 	tiling.stride = 1024;
 	ret = ioctl(fd, DRM_IOCTL_I915_GEM_SET_TILING, &tiling);
 	assert(ret == 0);
+	assert(tiling.tiling_mode == I915_TILING_X);
 
 	memset(&mmap_arg, 0, sizeof(mmap_arg));
 	mmap_arg.handle = handle;