diff --git a/libraries/libldap/result.c b/libraries/libldap/result.c
index bc47ddafe0..b458ff35a8 100644
--- a/libraries/libldap/result.c
+++ b/libraries/libldap/result.c
@@ -57,6 +57,7 @@
 #include <ac/stdlib.h>
 
 #include <ac/errno.h>
+#include <ac/param.h>
 #include <ac/socket.h>
 #include <ac/string.h>
 #include <ac/time.h>