diff --git a/resources/ui/adw/Portal.ui b/resources/ui/adw/Portal.ui
index 2fcb82f..3b5ee15 100644
--- a/resources/ui/adw/Portal.ui
+++ b/resources/ui/adw/Portal.ui
@@ -2,8 +2,7 @@
 
 <!--
 SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
-SPDX-License-Identifier:
-GPL-3.0-or-later
+SPDX-License-Identifier: GPL-3.0-or-later
 -->
 
 <interface domain="burn-my-windows">
diff --git a/resources/ui/gtk3/Portal.ui b/resources/ui/gtk3/Portal.ui
index 65cf67c..3df8685 100644
--- a/resources/ui/gtk3/Portal.ui
+++ b/resources/ui/gtk3/Portal.ui
@@ -2,8 +2,7 @@
 
 <!--
 SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
-SPDX-License-Identifier:
-GPL-3.0-or-later
+SPDX-License-Identifier: GPL-3.0-or-later
 -->
 
 <interface domain="burn-my-windows">
diff --git a/resources/ui/gtk4/Portal.ui b/resources/ui/gtk4/Portal.ui
index 2b1e540..d5d5e0f 100644
--- a/resources/ui/gtk4/Portal.ui
+++ b/resources/ui/gtk4/Portal.ui
@@ -2,8 +2,7 @@
 
 <!--
 SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
-SPDX-License-Identifier:
-GPL-3.0-or-later
+SPDX-License-Identifier: GPL-3.0-or-later
 -->
 
 <interface domain="burn-my-windows">
diff --git a/schemas/org.gnome.shell.extensions.burn-my-windows.gschema.xml b/schemas/org.gnome.shell.extensions.burn-my-windows.gschema.xml
index 5b1097d..97b5ace 100644
--- a/schemas/org.gnome.shell.extensions.burn-my-windows.gschema.xml
+++ b/schemas/org.gnome.shell.extensions.burn-my-windows.gschema.xml
@@ -2,8 +2,7 @@
 
 <!--
 SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
-SPDX-License-Identifier:
-CC0-1.0
+SPDX-License-Identifier: CC0-1.0
 -->
 
 <schemalist>