diff --git a/contrib/netbsd-tests/lib/libc/gen/t_ttyname.c b/contrib/netbsd-tests/lib/libc/gen/t_ttyname.c
index 0c10c249644..80f5c17c1cb 100644
--- a/contrib/netbsd-tests/lib/libc/gen/t_ttyname.c
+++ b/contrib/netbsd-tests/lib/libc/gen/t_ttyname.c
@@ -107,6 +107,9 @@ ATF_TC_BODY(ttyname_r_err, tc)
 		ATF_REQUIRE(rv == ERANGE);
 	}
 
+#if defined(__FreeBSD__)
+	atf_tc_expect_fail("FreeBSD returns ENOTTY instead of EBADF; see bin/191936");
+#endif
 	rv = ttyname_r(-1, buf, ttymax);
 	ATF_REQUIRE(rv == EBADF);