diff --git a/src/corelib/text/qstringconverter_base.h b/src/corelib/text/qstringconverter_base.h
index 7978f8bc590..5b0f30254c5 100644
--- a/src/corelib/text/qstringconverter_base.h
+++ b/src/corelib/text/qstringconverter_base.h
@@ -81,7 +81,10 @@ public:
         Q_DISABLE_COPY(State)
     };
 protected:
+    QStringConverterBase() = default;
     ~QStringConverterBase() = default;
+    QStringConverterBase(QStringConverterBase &&) = default;
+    QStringConverterBase &operator=(QStringConverterBase &&) = default;
 };
 Q_DECLARE_OPERATORS_FOR_FLAGS(QStringConverterBase::Flags)