diff --git a/src/corelib/tools/qstring.h b/src/corelib/tools/qstring.h
index de5cd2cfa92f2868936afa5529e9518f143e3d04..781afc5bbab31bde2ca1e80fe9da1950eb5d1f72 100644
--- a/src/corelib/tools/qstring.h
+++ b/src/corelib/tools/qstring.h
@@ -664,7 +664,7 @@ class QLatin1String
 public:
     Q_DECL_CONSTEXPR inline explicit QLatin1String(const char *s) : m_size(s ? int(strlen(s)) : 0), m_data(s) {}
     Q_DECL_CONSTEXPR inline explicit QLatin1String(const char *s, int sz) : m_size(sz), m_data(s) {}
-    Q_DECL_CONSTEXPR inline explicit QLatin1String(const QByteArray &s) : m_size(strlen(s.constData())), m_data(s.constData()) {}
+    inline explicit QLatin1String(const QByteArray &s) : m_size(strlen(s.constData())), m_data(s.constData()) {}
 
     inline const char *latin1() const { return m_data; }
     inline int size() const { return m_size; }