diff --git a/src/plugins/coreplugin/loggingviewer.cpp b/src/plugins/coreplugin/loggingviewer.cpp
index cc2b8226810..57a1f42282b 100644
--- a/src/plugins/coreplugin/loggingviewer.cpp
+++ b/src/plugins/coreplugin/loggingviewer.cpp
@@ -114,7 +114,7 @@ private:
     bool m_started{false};
 };
 
-QLoggingCategory::CategoryFilter LogCategoryRegistry::s_oldFilter;
+QLoggingCategory::CategoryFilter LogCategoryRegistry::s_oldFilter = nullptr;
 
 struct SavedEntry
 {