diff --git a/Modules/ldapcontrol.c b/Modules/ldapcontrol.c
index b76d33c..7d8fbe3 100644
--- a/Modules/ldapcontrol.c
+++ b/Modules/ldapcontrol.c
@@ -4,6 +4,7 @@
 #include "LDAPObject.h"
 #include "ldapcontrol.h"
 #include "berval.h"
+#include "constants.h"
 
 #include "lber.h"