diff --git a/models/login_source.go b/models/login_source.go
index ce03c4154f..b8441adcc4 100644
--- a/models/login_source.go
+++ b/models/login_source.go
@@ -1,4 +1,5 @@
 // Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
 
@@ -403,6 +404,19 @@ func LoginViaLDAP(user *User, login, password string, source *LoginSource, autoR
 
 	var isAttributeSSHPublicKeySet = len(strings.TrimSpace(source.LDAP().AttributeSSHPublicKey)) > 0
 
+	// Update User admin flag if exist
+	if isExist, err := IsUserExist(0, sr.Username); err != nil {
+		return nil, err
+	} else if isExist &&
+		!user.ProhibitLogin && len(source.LDAP().AdminFilter) > 0 && user.IsAdmin != sr.IsAdmin {
+		// Change existing admin flag only if AdminFilter option is set
+		user.IsAdmin = sr.IsAdmin
+		err = UpdateUserCols(user, "is_admin")
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	if !autoRegister {
 		if isAttributeSSHPublicKeySet && synchronizeLdapSSHPublicKeys(user, source, sr.SSHPublicKey) {
 			return user, RewriteAllPublicKeys()