diff --git a/servers/slapd/syslog.c b/servers/slapd/syslog.c
index 47ea1c6d9d..50f30530f9 100644
--- a/servers/slapd/syslog.c
+++ b/servers/slapd/syslog.c
@@ -209,7 +209,7 @@ openlog(const char *ident, int logstat, int logfac)
 }
 
 void
-closelog()
+closelog(void)
 {
 	(void)close(LogFile);
 	LogFile = -1;