diff --git a/man3/getsubopt.3 b/man3/getsubopt.3
index 1cd1b3f16..2709b301e 100644
--- a/man3/getsubopt.3
+++ b/man3/getsubopt.3
@@ -40,9 +40,9 @@ Feature Test Macro Requirements for glibc (see
 .PD 0
 .TP 4
 Since glibc 2.12
-_XOPEN_SOURCE >= 500 ||
-_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED ||
-_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700
+_XOPEN_SOURCE\ >= 500 ||
+_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED ||
+_POSIX_C_SOURCE\ >=\ 200809L || _XOPEN_SOURCE\ >=\ 700
 .TP
 Before glibc 2.12
 _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED