diff --git a/demos/widget-factory/widget-factory.ui b/demos/widget-factory/widget-factory.ui
index 1ebb6efbde..d1ad3ffaff 100644
--- a/demos/widget-factory/widget-factory.ui
+++ b/demos/widget-factory/widget-factory.ui
@@ -3057,9 +3057,6 @@ microphone-sensitivity-medium-symbolic</property>
                                               <class name="small-button"/>
                                             </style>
                                           </object>
-                                          <packing>
-                                            <property name="pack-type">end</property>
-                                          </packing>
                                         </child>
                                       </object>
                                     </child>
@@ -3090,9 +3087,6 @@ microphone-sensitivity-medium-symbolic</property>
                                               <class name="small-button"/>
                                             </style>
                                           </object>
-                                          <packing>
-                                            <property name="pack-type">end</property>
-                                          </packing>
                                         </child>
                                       </object>
                                     </child>
diff --git a/gtk/inspector/recorder.ui b/gtk/inspector/recorder.ui
index 7f3f0ccc89..2ee6e90d0f 100644
--- a/gtk/inspector/recorder.ui
+++ b/gtk/inspector/recorder.ui
@@ -31,6 +31,8 @@
                 <property name="icon-name">insert-object-symbolic</property>
                 <property name="tooltip-text" translatable="yes">Add debug nodes</property>
                 <property name="active" bind-source="GtkInspectorRecorder" bind-property="debug-nodes" bind-flags="bidirectional|sync-create"/>
+                <property name="halign">start</property>
+                <property name="hexpand">1</property>
               </object>
             </child>
             <child>
@@ -41,9 +43,6 @@
                 <property name="tooltip-text" translatable="yes">Save selected node</property>
                 <signal name="clicked" handler="render_node_save"/>
               </object>
-              <packing>
-                <property name="pack-type">end</property>
-              </packing>
             </child>
           </object>
         </child>
diff --git a/gtk/ui/gtkappchooserdialog.ui b/gtk/ui/gtkappchooserdialog.ui
index 6717125671..9c09d757c7 100644
--- a/gtk/ui/gtkappchooserdialog.ui
+++ b/gtk/ui/gtkappchooserdialog.ui
@@ -21,10 +21,9 @@
         <child internal-child="action_area">
           <object class="GtkButtonBox" id="dialog-action_area1">
             <property name="layout-style">end</property>
+            <property name="hexpand">1</property>
+            <property name="halign">end</property>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
         <child>
           <object class="GtkBox" id="inner_box">
diff --git a/gtk/ui/gtkdialog.ui b/gtk/ui/gtkdialog.ui
index 1a9728a7e6..d2d2638947 100644
--- a/gtk/ui/gtkdialog.ui
+++ b/gtk/ui/gtkdialog.ui
@@ -28,14 +28,8 @@
                   <class name="dialog-action-area"/>
                 </style>
               </object>
-              <packing>
-                <property name="pack-type">end</property>
-              </packing>
             </child>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
       </object>
     </child>
diff --git a/gtk/ui/gtkfilechooserdialog.ui b/gtk/ui/gtkfilechooserdialog.ui
index 4b75045015..1b37a4ce0e 100644
--- a/gtk/ui/gtkfilechooserdialog.ui
+++ b/gtk/ui/gtkfilechooserdialog.ui
@@ -13,10 +13,9 @@
           <object class="GtkButtonBox" id="dialog-action_area1">
             <property name="margin">6</property>
             <property name="layout-style">end</property>
+            <property name="hexpand">1</property>
+            <property name="halign">end</property>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
         <child>
           <object class="GtkFileChooserWidget" id="widget">
diff --git a/gtk/ui/gtkfilechooserwidget.ui b/gtk/ui/gtkfilechooserwidget.ui
index fbb53bd76e..5da98365cf 100644
--- a/gtk/ui/gtkfilechooserwidget.ui
+++ b/gtk/ui/gtkfilechooserwidget.ui
@@ -65,10 +65,6 @@
                                         <property name="icon-name">folder-new-symbolic</property>
                                         <signal name="notify::active" handler="new_folder_popover_active"/>
                                       </object>
-                                      <packing>
-                                        <property name="pack-type">end</property>
-                                        <property name="position">1</property>
-                                      </packing>
                                     </child>
                                   </object>
                                   <packing>
@@ -101,9 +97,6 @@
                                       <object class="GtkSpinner" id="search_spinner">
                                         <property name="visible">0</property>
                                       </object>
-                                      <packing>
-                                        <property name="pack-type">end</property>
-                                      </packing>
                                     </child>
                                   </object>
                                   <packing>
@@ -367,9 +360,6 @@
                     <property name="valign">start</property>
                     <signal name="changed" handler="filter_combo_changed" swapped="no"/>
                   </object>
-                  <packing>
-                    <property name="pack-type">end</property>
-                  </packing>
                 </child>
               </object>
               <packing>
@@ -377,10 +367,6 @@
               </packing>
             </child>
           </object>
-          <packing>
-            <property name="position">1</property>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
       </object>
     </child>
diff --git a/gtk/ui/gtkprintunixdialog.ui b/gtk/ui/gtkprintunixdialog.ui
index ad005f4e0f..056877c5c0 100644
--- a/gtk/ui/gtkprintunixdialog.ui
+++ b/gtk/ui/gtkprintunixdialog.ui
@@ -1169,7 +1169,6 @@
                 </child>
               </object>
               <packing>
-                <property name="pack-type">end</property>
                 <property name="position">1</property>
               </packing>
             </child>
diff --git a/testsuite/gtk/builder.c b/testsuite/gtk/builder.c
index e662570a26..6d320bf454 100644
--- a/testsuite/gtk/builder.c
+++ b/testsuite/gtk/builder.c
@@ -983,22 +983,16 @@ test_child_properties (void)
     "  <object class=\"GtkBox\" id=\"vbox1\">"
     "    <child>"
     "      <object class=\"GtkLabel\" id=\"label1\"/>"
-    "      <packing>"
-    "        <property name=\"pack-type\">start</property>"
-    "      </packing>"
     "    </child>"
     "    <child>"
     "      <object class=\"GtkLabel\" id=\"label2\"/>"
-    "      <packing>"
-    "        <property name=\"pack-type\">end</property>"
-    "      </packing>"
     "    </child>"
     "  </object>"
     "</interface>";
 
   GObject *label, *vbox;
-  GtkPackType pack_type;
-  
+  int position;
+
   builder = builder_new_from_string (buffer1, -1, NULL);
   vbox = gtk_builder_get_object (builder, "vbox1");
   g_assert (GTK_IS_BOX (vbox));
@@ -1007,19 +1001,19 @@ test_child_properties (void)
   g_assert (GTK_IS_LABEL (label));
   gtk_container_child_get (GTK_CONTAINER (vbox),
                            GTK_WIDGET (label),
-                           "pack-type",
-                           &pack_type,
+                           "position",
+                           &position,
                            NULL);
-  g_assert (pack_type == GTK_PACK_START);
-  
+  g_assert_cmpint (position, ==, 0);
+
   label = gtk_builder_get_object (builder, "label2");
   g_assert (GTK_IS_LABEL (label));
   gtk_container_child_get (GTK_CONTAINER (vbox),
                            GTK_WIDGET (label),
-                           "pack-type",
-                           &pack_type,
+                           "position",
+                           &position,
                            NULL);
-  g_assert (pack_type == GTK_PACK_END);
+  g_assert_cmpint (position, ==, 1);
 
   g_object_unref (builder);
 }
@@ -1787,9 +1781,6 @@ test_reference_counting (void)
     "        <property name=\"orientation\">vertical</property>"
     "    <child>"
     "      <object class=\"GtkLabel\" id=\"label1\"/>"
-    "      <packing>"
-    "        <property name=\"pack-type\">start</property>"
-    "      </packing>"
     "    </child>"
     "  </object>"
     "</interface>";