diff --git a/mmgui-missing-appdata-tags.patch b/mmgui-missing-appdata-tags.patch
new file mode 100644
index 0000000..ced2d12
--- /dev/null
+++ b/mmgui-missing-appdata-tags.patch
@@ -0,0 +1,19 @@
+--- modem-manager-gui-0.0.19.1/appdata/modem-manager-gui.appdata.xml.in	2018-04-06 16:43:09.000000000 +0200
++++ modem-manager-gui-0.0.19.1/appdata/modem-manager-gui.appdata--patched.xml.in	2020-02-02 09:35:47.979414562 +0100
+@@ -59,9 +59,15 @@
+   <category>System</category>
+   <category>Utility</category>
+   <category>Network</category>
+   <category>TelephonyTools</category>
+-​ </categories>
++</categories>
++  <content_rating type="oars-1.1">
++    <content_attribute id="social-chat">intense</content_attribute>
++  </content_rating>
++  <releases>
++    <release version="0.0.19.1" date="2018-04-06" />
++  </releases>
+  <kudos>
+   <kudo>AppMenu</kudo>
+   <kudo>Notifications</kudo>
+   <kudo>ModernToolkit</kudo>
diff --git a/modem-manager-gui.spec b/modem-manager-gui.spec
index 4281bcf..8fd2f17 100644
--- a/modem-manager-gui.spec
+++ b/modem-manager-gui.spec
@@ -4,7 +4,7 @@ Summary(de):   Grafische Oberfläche für ModemManager
 Summary(ru):   Графический интерфейс для демона ModemManager
 
 Version:       0.0.19.1
-Release:       11%{?dist}
+Release:       12%{?dist}
 License:       GPLv3
 
 URL:           https://linuxonly.ru/page/modem-manager-gui
@@ -21,6 +21,9 @@ Patch2: mmgui-83553d042443c71be71533b6b91ee10f228d935f.diff
 # Fix the NetworkManager dispatcher script location
 Patch3: 0001-Move-the-NetworkManager-dispatcher-script-out-of-etc.patch
 
+# Appdata XML validation fails
+Patch4: mmgui-missing-appdata-tags.patch
+
 %global build_using_meson 0
 %global with_ofono 0
 
@@ -141,6 +144,7 @@ Plugin for %{name} allowing to use ofono as the modem manager.
 %patch1 -p1
 %patch2 -p1
 %patch3 -p1
+%patch4 -p1
 sed -e "s/meson_version: '>=0.37'/meson_version: '>=0.38'/" -i meson.build
 
 
@@ -222,6 +226,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/%{name}.desktop
 
 
 %changelog
+* Sun Feb 02 2020 Artur Iwicki <fedora@svgames.pl> - 0.0.19.1-12
+- Add a patch to fix Appdata XML validation errors
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.0.19.1-11
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild