diff --git a/include/ldap.h b/include/ldap.h
index d3b1dfada9..09f5789175 100644
--- a/include/ldap.h
+++ b/include/ldap.h
@@ -186,6 +186,11 @@ typedef struct ldapcontrol {
 
 #define LDAP_CONTROL_MANAGEDSAIT "2.16.840.1.113730.3.4.2"
 
+#define LDAP_CONTROL_DUPENT	LDAP_CONTROL_DUPENT_REQUEST
+#define LDAP_CONTROL_DUPENT_REQUEST		"2.16.840.1.113719.1.27.101.1"
+#define LDAP_CONTROL_DUPENT_RESPONSE	"2.16.840.1.113719.1.27.101.2"
+#define LDAP_CONTROL_DUPENT_ENTRY		"2.16.840.1.113719.1.27.101.3"
+
 /* Experimental Controls */
 
 #define LDAP_CONTROL_SORTREQUEST    "1.2.840.113556.1.4.473"