diff --git a/include/tests/gui.h b/include/tests/gui.h
index 4a5a31d0..9c3d3a84 100644
--- a/include/tests/gui.h
+++ b/include/tests/gui.h
@@ -20,6 +20,7 @@ void __sidebar_selection_changed() {}
 #ifdef TEST_NEED_COLLECTION
 void __collection_activated() {}
 void __collection_add() {}
+void __collection_buttonpress() {}
 void __collection_keypress() {}
 void __collection_selection_changed() {}
 void __collection_toggled() {}