diff --git a/servers/slapd/slap.h b/servers/slapd/slap.h
index 946f56aae8..41438d271d 100644
--- a/servers/slapd/slap.h
+++ b/servers/slapd/slap.h
@@ -9,6 +9,7 @@
 #include <ac/syslog.h>
 #include <ac/regex.h>
 #include <ac/socket.h>
+#include <ac/time.h>
 
 #include "avl.h"