diff --git a/libraries/libldap/tls.c b/libraries/libldap/tls.c
index 3ec9e9a1ad..95cf256d01 100644
--- a/libraries/libldap/tls.c
+++ b/libraries/libldap/tls.c
@@ -16,6 +16,7 @@
 #include <ac/string.h>
 #include <ac/time.h>
 #include <ac/unistd.h>
+#include <ac/param.h>
 
 #include "ldap-int.h"