diff --git a/man2/chmod.2 b/man2/chmod.2
index 22007ad33..61b7e4850 100644
--- a/man2/chmod.2
+++ b/man2/chmod.2
@@ -56,10 +56,11 @@ Feature Test Macro Requirements for glibc (see
 .PD 0
 .BR fchmod ():
 .RS 4
-_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
+/* Since glibc 2.16: */ _POSIX_C_SOURCE
+    || /* Glibc versions <= 2.19: */ _BSD_SOURCE
+    || /* Glibc versions <= 2.15: */ _XOPEN_SOURCE\ >=\ 500
 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
-.br
-    || /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L
+    || /* Glibc 2.12 to 2.15: */ _POSIX_C_SOURCE\ >=\ 200809L
 .RE
 .PD
 .sp