diff --git a/doc/man/man5/ldap.conf.5 b/doc/man/man5/ldap.conf.5
index e731414c1b..f77fcf18a1 100644
--- a/doc/man/man5/ldap.conf.5
+++ b/doc/man/man5/ldap.conf.5
@@ -171,7 +171,7 @@ list of hosts may be provided.
 is deprecated in favor of
 .BR URI .
 .TP
-.B _KEEPALIVE_IDLE
+.B KEEPALIVE_IDLE
 Sets/gets the number of seconds a connection needs to remain idle
 before TCP starts sending keepalive probes. Linux only.
 .TP