diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 9bd35bb..a74a514 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -238,7 +238,7 @@
 // As we move some FORTIFY checks to be always on, __bos needs to be
 // always available.
 #if defined(__BIONIC_FORTIFY)
-#  if _FORTIFY_SOURCE == 2
+#  if _FORTIFY_SOURCE > 1
 #    define __bos_level 1
 #  else
 #    define __bos_level 0