diff --git a/tests/auto/corelib/tools/qstringapisymmetry/qstringapisymmetry.pro b/tests/auto/corelib/tools/qstringapisymmetry/qstringapisymmetry.pro
index bc38b17949..a4e91e38bd 100644
--- a/tests/auto/corelib/tools/qstringapisymmetry/qstringapisymmetry.pro
+++ b/tests/auto/corelib/tools/qstringapisymmetry/qstringapisymmetry.pro
@@ -3,3 +3,4 @@ TARGET = tst_qstringapisymmetry
 QT = core testlib
 SOURCES = tst_qstringapisymmetry.cpp
 qtConfig(c++14): CONFIG += c++14
+qtConfig(c++1z): CONFIG += c++1z