diff --git a/tools/testing/selftests/openat2/openat2_test.c b/tools/testing/selftests/openat2/openat2_test.c
index 453152b58..1045df1a9 100755
--- a/tools/testing/selftests/openat2/openat2_test.c
+++ b/tools/testing/selftests/openat2/openat2_test.c
@@ -5,6 +5,7 @@
  */
 
 #define _GNU_SOURCE
+#define __SANE_USERSPACE_TYPES__ // Use ll64
 #include <fcntl.h>
 #include <sched.h>
 #include <sys/stat.h>