diff --git a/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in b/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
index 87f9267e67..94d7145670 100644
--- a/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
+++ b/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<component type="desktop">
+<component xmlns="https://specifications.freedesktop.org/metainfo/1.0" type="desktop">
   <id>org.gtk.Demo4</id>
   <launchable type="desktop-id">org.gtk.Demo4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
diff --git a/demos/node-editor/org.gtk.gtk4.NodeEditor.appdata.xml.in b/demos/node-editor/org.gtk.gtk4.NodeEditor.appdata.xml.in
index 26ee6ff4d9..16b7e92657 100644
--- a/demos/node-editor/org.gtk.gtk4.NodeEditor.appdata.xml.in
+++ b/demos/node-editor/org.gtk.gtk4.NodeEditor.appdata.xml.in
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<component type="desktop">
+<component xmlns="https://specifications.freedesktop.org/metainfo/1.0" type="desktop">
   <id>org.gtk.gtk4.NodeEditor</id>
   <launchable type="desktop-id">org.gtk.gtk4.NodeEditor.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
diff --git a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
index bdee5bbe67..66f5e43d3a 100644
--- a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
+++ b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<component type="desktop">
+<component xmlns="https://specifications.freedesktop.org/metainfo/1.0" type="desktop">
   <id>org.gtk.PrintEditor4</id>
   <launchable type="desktop-id">org.gtk.PrintEditor4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
diff --git a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
index 284b7419c2..b976069fb7 100644
--- a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
+++ b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<component type="desktop">
+<component xmlns="https://specifications.freedesktop.org/metainfo/1.0" type="desktop">
   <id>org.gtk.WidgetFactory4</id>
   <launchable type="desktop-id">org.gtk.WidgetFactory4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>