diff --git a/src/plugins/mercurial/CMakeLists.txt b/src/plugins/mercurial/CMakeLists.txt
index 915b9a8cdf0..277dd230f0c 100644
--- a/src/plugins/mercurial/CMakeLists.txt
+++ b/src/plugins/mercurial/CMakeLists.txt
@@ -2,7 +2,7 @@ add_qtc_plugin(Mercurial
   PLUGIN_DEPENDS Core TextEditor VcsBase
   SOURCES
     annotationhighlighter.cpp annotationhighlighter.h
-    authenticationdialog.cpp authenticationdialog.h authenticationdialog.ui
+    authenticationdialog.cpp authenticationdialog.h
     commiteditor.cpp commiteditor.h
     constants.h
     mercurialclient.cpp mercurialclient.h
diff --git a/src/plugins/mercurial/authenticationdialog.cpp b/src/plugins/mercurial/authenticationdialog.cpp
index e79e3d1a84e..c04fb34d655 100644
--- a/src/plugins/mercurial/authenticationdialog.cpp
+++ b/src/plugins/mercurial/authenticationdialog.cpp
@@ -2,39 +2,55 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
 
 #include "authenticationdialog.h"
-#include "ui_authenticationdialog.h"
 
-namespace Mercurial {
-namespace Internal  {
+#include <utils/layoutbuilder.h>
 
-AuthenticationDialog::AuthenticationDialog(const QString &username, const QString &password, QWidget *parent) :
-    QDialog(parent),
-    ui(new Ui::AuthenticationDialog)
+#include <QDialogButtonBox>
+#include <QLineEdit>
+
+namespace Mercurial::Internal {
+
+AuthenticationDialog::AuthenticationDialog(const QString &username, const QString &password, QWidget *parent)
+    : QDialog(parent)
 {
-    ui->setupUi(this);
-    ui->username->setText(username);
-    ui->password->setText(password);
+    resize(312, 116);
+
+    m_username = new QLineEdit(username);
+
+    m_password = new QLineEdit(password);
+    m_password->setEchoMode(QLineEdit::Password);
+
+    auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Cancel|QDialogButtonBox::Ok);
+
+    using namespace Utils::Layouting;
+
+    Column {
+        Form {
+            tr("Username:"), m_username, br,
+            tr("Password:"), m_password
+        },
+        buttonBox
+    }.attachTo(this);
+
+    connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
 }
 
-AuthenticationDialog::~AuthenticationDialog()
-{
-    delete ui;
-}
+AuthenticationDialog::~AuthenticationDialog() = default;
 
 void AuthenticationDialog::setPasswordEnabled(bool enabled)
 {
-    ui->password->setEnabled(enabled);
+    m_password->setEnabled(enabled);
 }
 
 QString AuthenticationDialog::getUserName()
 {
-    return ui->username->text();
+    return m_username->text();
 }
 
 QString AuthenticationDialog::getPassword()
 {
-    return ui->password->text();
+    return m_password->text();
 }
 
-} // namespace Internal
-} // namespace Mercurial
+} // Mercurial::Internal
diff --git a/src/plugins/mercurial/authenticationdialog.h b/src/plugins/mercurial/authenticationdialog.h
index 30537f141ac..2b6eb454401 100644
--- a/src/plugins/mercurial/authenticationdialog.h
+++ b/src/plugins/mercurial/authenticationdialog.h
@@ -5,10 +5,11 @@
 
 #include <QDialog>
 
-namespace Mercurial {
-namespace Internal {
+QT_BEGIN_NAMESPACE
+class QLineEdit;
+QT_END_NAMESPACE
 
-namespace Ui { class AuthenticationDialog; }
+namespace Mercurial::Internal {
 
 class AuthenticationDialog : public QDialog
 {
@@ -18,13 +19,14 @@ public:
     explicit AuthenticationDialog(const QString &username, const QString &password,
                                   QWidget *parent = nullptr);
     ~AuthenticationDialog() override;
+
     void setPasswordEnabled(bool enabled);
     QString getUserName();
     QString getPassword();
 
 private:
-    Ui::AuthenticationDialog *ui;
+    QLineEdit *m_username;
+    QLineEdit *m_password;
 };
 
-} // namespace Internal
-} // namespace Mercurial
+} // Mercurial::Internal
diff --git a/src/plugins/mercurial/authenticationdialog.ui b/src/plugins/mercurial/authenticationdialog.ui
deleted file mode 100644
index 3d12e2c1f7e..00000000000
--- a/src/plugins/mercurial/authenticationdialog.ui
+++ /dev/null
@@ -1,92 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>Mercurial::Internal::AuthenticationDialog</class>
- <widget class="QDialog" name="Mercurial::Internal::AuthenticationDialog">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>312</width>
-    <height>116</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>Dialog</string>
-  </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
-    <layout class="QFormLayout" name="formLayout">
-     <item row="0" column="0">
-      <widget class="QLabel" name="usernameLabel">
-       <property name="text">
-        <string>Username:</string>
-       </property>
-      </widget>
-     </item>
-     <item row="0" column="1">
-      <widget class="QLineEdit" name="username"/>
-     </item>
-     <item row="1" column="0">
-      <widget class="QLabel" name="passwordLabel">
-       <property name="text">
-        <string>Password:</string>
-       </property>
-      </widget>
-     </item>
-     <item row="1" column="1">
-      <widget class="QLineEdit" name="password">
-       <property name="echoMode">
-        <enum>QLineEdit::Password</enum>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-   <item>
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-    </widget>
-   </item>
-  </layout>
- </widget>
- <resources/>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>Mercurial::Internal::AuthenticationDialog</receiver>
-   <slot>accept()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>157</x>
-     <y>274</y>
-    </hint>
-   </hints>
-  </connection>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>rejected()</signal>
-   <receiver>Mercurial::Internal::AuthenticationDialog</receiver>
-   <slot>reject()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>316</x>
-     <y>260</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>286</x>
-     <y>274</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
-</ui>
diff --git a/src/plugins/mercurial/mercurial.qbs b/src/plugins/mercurial/mercurial.qbs
index 0f8b5613bf1..f657f7bc5ed 100644
--- a/src/plugins/mercurial/mercurial.qbs
+++ b/src/plugins/mercurial/mercurial.qbs
@@ -16,7 +16,6 @@ QtcPlugin {
         "annotationhighlighter.h",
         "authenticationdialog.cpp",
         "authenticationdialog.h",
-        "authenticationdialog.ui",
         "commiteditor.cpp",
         "commiteditor.h",
         "constants.h",