diff --git a/app/ldap/server/sync.js b/app/ldap/server/sync.js
index 9778bad9a3dcc..76ded3a124dc6 100644
--- a/app/ldap/server/sync.js
+++ b/app/ldap/server/sync.js
@@ -356,6 +356,9 @@ export function syncUserData(user, ldapUser, ldap) {
 			_setRealName(user._id, userData.name);
 			delete userData.name;
 		}
+		userData.customFields = {
+			...user.customFields, ...userData.customFields,
+		};
 		Meteor.users.update(user._id, { $set: userData });
 		user = Meteor.users.findOne({ _id: user._id });
 	}