diff --git a/contrib/slapd-modules/passwd/radius.c b/contrib/slapd-modules/passwd/radius.c
index 22aa461eaf..0e9bb36d1e 100644
--- a/contrib/slapd-modules/passwd/radius.c
+++ b/contrib/slapd-modules/passwd/radius.c
@@ -12,6 +12,8 @@
  * <http://www.OpenLDAP.org/license.html>.
  */
 
+#include "portable.h"
+
 #include <stdio.h>
 
 #include <lber.h>