diff --git a/common/treemodel.h b/common/treemodel.h
index dee5661..0d6b5ac 100644
--- a/common/treemodel.h
+++ b/common/treemodel.h
@@ -125,7 +125,7 @@ public:
     UString data(const UModelIndex &index, int role) const;
     UString headerData(int section, int orientation, int role = 0) const;
 
-    TreeModel() : markingEnabledFlag(false) {
+    TreeModel() : markingEnabledFlag(false), markingDarkModeFlag(false) {
         rootItem = new TreeItem(0, Types::Root, 0, UString(), UString(), UString(), UByteArray(), UByteArray(), UByteArray(), true, false);
     }