diff --git a/man2/gethostname.2 b/man2/gethostname.2
index def1f37b5..91caf1e66 100644
--- a/man2/gethostname.2
+++ b/man2/gethostname.2
@@ -47,11 +47,10 @@ Feature Test Macro Requirements for glibc (see
 .PP
 .ad l
 .BR gethostname ():
-.RS 4
-Since glibc 2.12:
-_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
-.br
-|| /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200112L
+    _XOPEN_SOURCE\ >=\ 500 || _POSIX_C_SOURCE\ >=\ 200112L ||
+        /* glibc 2.19 and earlier */ _BSD_SOURCE
+.\" The above is something of a simplification
+.\" also in glibc before 2.3 there was a bit churn
 .RE
 .PP
 .BR sethostname ():