diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 4c52c22300..8cfd1a8f8b 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -130,7 +130,7 @@ public:
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     inline QList(std::initializer_list<T> args)
         : d(const_cast<QListData::Data *>(&QListData::shared_null))
-    { std::copy(args.begin(), args.end(), std::back_inserter(*this)); }
+    { reserve(args.size()); std::copy(args.begin(), args.end(), std::back_inserter(*this)); }
 #endif
     bool operator==(const QList<T> &l) const;
     inline bool operator!=(const QList<T> &l) const { return !(*this == l); }