diff --git a/src/testlib/qtestcase.h b/src/testlib/qtestcase.h
index c3ccfc3f8c..4c226830e9 100644
--- a/src/testlib/qtestcase.h
+++ b/src/testlib/qtestcase.h
@@ -309,7 +309,7 @@ namespace QTest
     Q_TESTLIB_EXPORT void addColumnInternal(int id, const char *name);
 
     template <typename T>
-    inline void addColumn(const char *name, T * = 0)
+    inline void addColumn(const char *name, T * = nullptr)
     {
         typedef std::is_same<T, const char*> QIsSameTConstChar;
         Q_STATIC_ASSERT_X(!QIsSameTConstChar::value, "const char* is not allowed as a test data format.");