diff --git a/ui/details.ui b/ui/details.ui
index a16b0edc..eff3417d 100644
--- a/ui/details.ui
+++ b/ui/details.ui
@@ -559,7 +559,7 @@
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="is_important">True</property>
-                    <property name="label" translatable="yes">_Cancel</property>
+                    <property name="label" translatable="yes">_Cancel Installation</property>
                     <property name="use_underline">True</property>
                     <property name="stock_id">gtk-cancel</property>
                     <signal name="clicked" handler="on_details_cancel_customize_clicked" swapped="no"/>
diff --git a/virtManager/create.py b/virtManager/create.py
index f63676fc..48c238c6 100644
--- a/virtManager/create.py
+++ b/virtManager/create.py
@@ -1792,11 +1792,11 @@ class vmmCreate(vmmGObjectUI):
             logging.debug("User finished customize dialog, starting install")
             self.start_install(guest)
 
-        def details_closed(ignore):
-            logging.debug("User closed customize window, back to wizard")
+        def config_canceled(ignore):
+            logging.debug("User closed customize window, closing wizard")
             cleanup_config_window()
             self._undo_finish_cursor()
-            self.widget("summary-customize").set_active(False)
+            self.close()
 
         cleanup_config_window()
         self.config_window = vmmDetails(virtinst_guest, self.topwin)
@@ -1806,7 +1806,7 @@ class vmmCreate(vmmGObjectUI):
                                        start_install_wrapper,
                                        guest))
         self.config_window_signals.append(
-            self.config_window.connect("details-closed", details_closed))
+            self.config_window.connect("details-closed", config_canceled))
         self.config_window.show()
 
     def _install_finished_cb(self, error, details):
diff --git a/virtManager/details.py b/virtManager/details.py
index 29f388fe..a364e3c8 100644
--- a/virtManager/details.py
+++ b/virtManager/details.py
@@ -429,7 +429,7 @@ class vmmDetails(vmmGObjectUI):
         self.builder.connect_signals({
             "on_close_details_clicked": self.close,
             "on_details_menu_close_activate": self.close,
-            "on_vmm_details_delete_event": self.close,
+            "on_vmm_details_delete_event": self._window_delete_event,
             "on_vmm_details_configure_event": self.window_resized,
             "on_details_menu_quit_activate": self.exit_app,
             "on_hw_list_changed": self.hw_changed,
@@ -444,7 +444,7 @@ class vmmDetails(vmmGObjectUI):
             "on_control_fullscreen_toggled": self.control_fullscreen,
 
             "on_details_customize_finish_clicked": self.customize_finish,
-            "on_details_cancel_customize_clicked": self.close,
+            "on_details_cancel_customize_clicked": self._customize_cancel_clicked,
 
             "on_details_menu_virtual_manager_activate": self.control_vm_menu,
             "on_details_menu_run_activate": self.control_vm_run,
@@ -632,6 +632,25 @@ class vmmDetails(vmmGObjectUI):
 
         return self._close(customize_finish=True)
 
+    def _customize_cancel(self):
+        logging.debug("Asking to cancel customization")
+
+        result = self.err.yes_no(
+            _("This will abort the installation. Are you sure?"))
+        if not result:
+            logging.debug("Customize cancel aborted")
+            return
+
+        logging.debug("Canceling customization")
+        return self._close()
+
+    def _customize_cancel_clicked(self, src):
+        ignore = src
+        return self._customize_cancel()
+
+    def _window_delete_event(self, ignore1=None, ignore2=None):
+        return self._close()
+
     def close(self, ignore1=None, ignore2=None):
         logging.debug("Closing VM details: %s", self.vm)
         return self._close()