diff --git a/tests/auto/cplusplus/lexer/tst_lexer.cpp b/tests/auto/cplusplus/lexer/tst_lexer.cpp
index ecbd0f4ace9..fd365409028 100644
--- a/tests/auto/cplusplus/lexer/tst_lexer.cpp
+++ b/tests/auto/cplusplus/lexer/tst_lexer.cpp
@@ -403,7 +403,7 @@ void tst_SimpleLexer::ppOpOrPunc()
     QFETCH(Kind, expectedTokenKind);
 
     const QByteArray source = QTest::currentDataTag();
-    run(source, toTokens({expectedTokenKind}), false, CompareKind, true);
+    run(source, toTokens({unsigned(expectedTokenKind)}), false, CompareKind, true);
 }
 
 void tst_SimpleLexer::ppOpOrPunc_data()