diff --git a/testsuite/tools/simplify-data-3to4/assistant.expected b/testsuite/tools/simplify-data-3to4/assistant.expected
index 5b81816063..1c63dcb936 100644
--- a/testsuite/tools/simplify-data-3to4/assistant.expected
+++ b/testsuite/tools/simplify-data-3to4/assistant.expected
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkAssistant" id="window1">
-    <property name="type">popup</property>
     <child>
       <object class="GtkAssistantPage">
         <property name="title" translatable="yes">Page 1</property>
diff --git a/testsuite/tools/simplify-data-3to4/assistant.ui b/testsuite/tools/simplify-data-3to4/assistant.ui
index aed2044489..6a5454393a 100644
--- a/testsuite/tools/simplify-data-3to4/assistant.ui
+++ b/testsuite/tools/simplify-data-3to4/assistant.ui
@@ -3,7 +3,6 @@
   <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkAssistant" id="window1">
     <property name="can_focus">False</property>
-    <property name="type">popup</property>
     <child>
       <object class="GtkButton" id="button1">
         <property name="label" translatable="yes">Button 1</property>
diff --git a/testsuite/tools/simplify-data-3to4/grid.expected b/testsuite/tools/simplify-data-3to4/grid.expected
index cda31e5900..0e76b6e643 100644
--- a/testsuite/tools/simplify-data-3to4/grid.expected
+++ b/testsuite/tools/simplify-data-3to4/grid.expected
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window1">
-    <property name="type">popup</property>
     <child>
       <object class="GtkGrid" id="grid1">
         <child>
diff --git a/testsuite/tools/simplify-data-3to4/grid.ui b/testsuite/tools/simplify-data-3to4/grid.ui
index be79df3ce4..66bbf562b2 100644
--- a/testsuite/tools/simplify-data-3to4/grid.ui
+++ b/testsuite/tools/simplify-data-3to4/grid.ui
@@ -3,7 +3,6 @@
   <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkWindow" id="window1">
     <property name="can_focus">False</property>
-    <property name="type">popup</property>
     <child>
       <object class="GtkGrid" id="grid1">
         <property name="visible">True</property>
diff --git a/testsuite/tools/simplify-data-3to4/notebook.expected b/testsuite/tools/simplify-data-3to4/notebook.expected
index 60ac5bcc4f..c0f84f57f2 100644
--- a/testsuite/tools/simplify-data-3to4/notebook.expected
+++ b/testsuite/tools/simplify-data-3to4/notebook.expected
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window1">
-    <property name="type">popup</property>
     <child>
       <object class="GtkNotebook" id="notebook1">
         <child>
diff --git a/testsuite/tools/simplify-data-3to4/notebook.ui b/testsuite/tools/simplify-data-3to4/notebook.ui
index 46cc7378a2..0766f69366 100644
--- a/testsuite/tools/simplify-data-3to4/notebook.ui
+++ b/testsuite/tools/simplify-data-3to4/notebook.ui
@@ -3,7 +3,6 @@
   <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkWindow" id="window1">
     <property name="can_focus">False</property>
-    <property name="type">popup</property>
     <child>
       <object class="GtkNotebook" id="notebook1">
         <property name="visible">True</property>
diff --git a/testsuite/tools/simplify-data-3to4/stack.expected b/testsuite/tools/simplify-data-3to4/stack.expected
index f6321c9563..5bf7f70024 100644
--- a/testsuite/tools/simplify-data-3to4/stack.expected
+++ b/testsuite/tools/simplify-data-3to4/stack.expected
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window1">
-    <property name="type">popup</property>
     <child>
       <object class="GtkBox" id="box1">
         <child>
diff --git a/testsuite/tools/simplify-data-3to4/stack.ui b/testsuite/tools/simplify-data-3to4/stack.ui
index feb092eaad..aa3b60e567 100644
--- a/testsuite/tools/simplify-data-3to4/stack.ui
+++ b/testsuite/tools/simplify-data-3to4/stack.ui
@@ -3,7 +3,6 @@
   <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkWindow" id="window1">
     <property name="can_focus">False</property>
-    <property name="type">popup</property>
     <child>
       <object class="GtkBox" id="box1">
         <property name="visible">True</property>