diff --git a/omemo/gtk/key.py b/omemo/gtk/key.py
index 2d5e58a..9941344 100644
--- a/omemo/gtk/key.py
+++ b/omemo/gtk/key.py
@@ -26,11 +26,12 @@ from gi.repository import Gtk
 from gi.repository import GdkPixbuf
 
 from gajim.common import app
+from gajim.common.const import ButtonAction
 from gajim.plugins.plugins_i18n import _
 from gajim.plugins.helpers import get_builder
+from gajim.gtk.dialogs import NewConfirmationDialog
+from gajim.gtk.dialogs import DialogButton
 
-from omemo.gtk.util import DialogButton, ButtonAction
-from omemo.gtk.util import NewConfirmationDialog
 from omemo.backend.util import Trust
 from omemo.backend.util import IdentityKeyExtended
 from omemo.backend.util import get_fingerprint
@@ -278,17 +279,15 @@ class KeyRow(Gtk.ListBoxRow):
             self.get_parent().remove(self)
             self.destroy()
 
-        buttons = {
-            Gtk.ResponseType.CANCEL: DialogButton(_('Cancel')),
-            Gtk.ResponseType.OK: DialogButton(_('Delete'),
-                                              _remove,
-                                              ButtonAction.DESTRUCTIVE),
-        }
-
         NewConfirmationDialog(
+            _('Delete'),
             _('Delete Fingerprint'),
             _('Doing so will permanently delete this Fingerprint'),
-            buttons,
+            [DialogButton.make('Cancel'),
+             DialogButton.make('OK',
+                               text=_('Delete'),
+                               callback=_remove,
+                               action=ButtonAction.DESTRUCTIVE)],
             transient_for=self.get_toplevel())
 
     def set_trust(self):
diff --git a/omemo/gtk/util.py b/omemo/gtk/util.py
deleted file mode 100644
index 44ff2cf..0000000
--- a/omemo/gtk/util.py
+++ /dev/null
@@ -1,69 +0,0 @@
-# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
-#
-# This file is part of OMEMO Gajim Plugin.
-#
-# OMEMO Gajim Plugin is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published
-# by the Free Software Foundation; version 3 only.
-#
-# OMEMO Gajim Plugin is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with OMEMO Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.
-
-
-from collections import namedtuple
-from enum import IntEnum
-from enum import Enum
-
-from gi.repository import Gtk
-
-DialogButton = namedtuple('DialogButton', 'text callback action')
-DialogButton.__new__.__defaults__ = (None, None)  # type: ignore
-
-
-class ButtonAction(Enum):
-    DESTRUCTIVE = 'destructive-action'
-    SUGGESTED = 'suggested-action'
-
-
-class NewConfirmationDialog(Gtk.MessageDialog):
-    def __init__(self, text, sec_text, buttons, transient_for=None):
-        Gtk.MessageDialog.__init__(self,
-                                   transient_for=transient_for,
-                                   message_type=Gtk.MessageType.QUESTION,
-                                   text=text)
-
-        self._buttons = buttons
-
-        for response, button in buttons.items():
-            self.add_button(button.text, response)
-            if button.action is not None:
-                widget = self.get_widget_for_response(response)
-                widget.get_style_context().add_class(button.action.value)
-
-        self.format_secondary_markup(sec_text)
-
-        self.connect('response', self._on_response)
-
-        self.run()
-
-    def _on_response(self, dialog, response):
-        if response == Gtk.ResponseType.DELETE_EVENT:
-            # Look if DELETE_EVENT is mapped to another response
-            response = self._buttons.get(response, None)
-            if response is None:
-                # If DELETE_EVENT was not mapped we assume CANCEL
-                response = Gtk.ResponseType.CANCEL
-
-        button = self._buttons.get(response, None)
-        if button is None:
-            self.destroy()
-            return
-
-        if button.callback is not None:
-            button.callback()
-        self.destroy()