diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
index 0fd4044..ef40334 100644
--- a/res/layout/fragment_theme_picker.xml
+++ b/res/layout/fragment_theme_picker.xml
@@ -46,6 +46,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content">
             <Button
+                android:id="@+id/apply_button"
                 style="@style/ActionPrimaryButton"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"