diff --git a/tests/progs/slapd-addel.c b/tests/progs/slapd-addel.c
index 55b8dd994f..2f0df7b336 100644
--- a/tests/progs/slapd-addel.c
+++ b/tests/progs/slapd-addel.c
@@ -1,6 +1,7 @@
 #include "portable.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include <ac/string.h>
 #include <ac/ctype.h>