diff --git a/plugins/quickopen/projectitemquickopen.h b/plugins/quickopen/projectitemquickopen.h
--- a/plugins/quickopen/projectitemquickopen.h
+++ b/plugins/quickopen/projectitemquickopen.h
@@ -30,8 +30,9 @@
 class ResultCache
 {
 public:
-    ResultCache(std::function<Type()> func)
+    ResultCache(std::function<Type()> func, Type startResult)
         : m_func(func)
+        , m_result(startResult)
     {
     }
 
diff --git a/plugins/quickopen/projectitemquickopen.cpp b/plugins/quickopen/projectitemquickopen.cpp
--- a/plugins/quickopen/projectitemquickopen.cpp
+++ b/plugins/quickopen/projectitemquickopen.cpp
@@ -133,7 +133,7 @@
 ProjectItemDataProvider::ProjectItemDataProvider(KDevelop::IQuickOpen* quickopen)
     : m_itemTypes(NoItems)
     , m_quickopen(quickopen)
-    , m_addedItemsCountCache([this]() { return addedItems(m_addedItems); })
+    , m_addedItemsCountCache([this]() { return addedItems(m_addedItems); }, 0)
 {
 }