diff --git a/servers/slapd/proto-slap.h b/servers/slapd/proto-slap.h
index 9a066cda38..835c37f1d4 100644
--- a/servers/slapd/proto-slap.h
+++ b/servers/slapd/proto-slap.h
@@ -778,8 +778,8 @@ LDAP_SLAPD_F (int) slapd_daemon(void);
 LDAP_SLAPD_F (Listener **)	slapd_get_listeners LDAP_P((void));
 LDAP_SLAPD_F (void) slapd_remove LDAP_P((ber_socket_t s, Sockbuf *sb,
 	int wasactive, int wake, int locked ));
-LDAP_SLAPD_F (void) slapd_sd_lock();
-LDAP_SLAPD_F (void) slapd_sd_unlock();
+LDAP_SLAPD_F (void) slapd_sd_lock LDAP_P((void));
+LDAP_SLAPD_F (void) slapd_sd_unlock LDAP_P((void));
 
 LDAP_SLAPD_F (RETSIGTYPE) slap_sig_shutdown LDAP_P((int sig));
 LDAP_SLAPD_F (RETSIGTYPE) slap_sig_wake LDAP_P((int sig));