diff --git a/include/ldap.h b/include/ldap.h
index 6e4e5be9da..e484ce5993 100644
--- a/include/ldap.h
+++ b/include/ldap.h
@@ -180,7 +180,7 @@ typedef struct ldapcontrol {
 
 /* LDAP Extended Operations */
 #define LDAP_EXOP_X_MODIFY_PASSWD "1.3.6.1.4.1.4203.666.6.1"
-#define LDAP_EXOP_X_START_TLS "1.3.6.1.4.1.1466.20037"
+#define LDAP_EXOP_START_TLS "1.3.6.1.4.1.1466.20037"
 
 
 /*