diff --git a/man3/clearenv.3 b/man3/clearenv.3
index b02f3ec49..548b3b4e1 100644
--- a/man3/clearenv.3
+++ b/man3/clearenv.3
@@ -37,7 +37,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR clearenv ():
-_SVID_SOURCE || _XOPEN_SOURCE
+_SVID_SOURCE || _BSD_SOURCE
 .SH DESCRIPTION
 The
 .BR clearenv ()