diff --git a/src/shared/proparser/proitems.h b/src/shared/proparser/proitems.h
index fd48bb4eb00..7aa893a0a83 100644
--- a/src/shared/proparser/proitems.h
+++ b/src/shared/proparser/proitems.h
@@ -80,10 +80,10 @@ public:
     ProString &append(const ProStringList &other, bool *pending = 0, bool skipEmpty1st = false);
     bool operator==(const ProString &other) const { return toQStringRef() == other.toQStringRef(); }
     bool operator==(const QString &other) const { return toQStringRef() == other; }
-    bool operator==(const QLatin1String &other) const  { return toQStringRef() == other; }
+    bool operator==(QLatin1String other) const  { return toQStringRef() == other; }
     bool operator!=(const ProString &other) const { return !(*this == other); }
     bool operator!=(const QString &other) const { return !(*this == other); }
-    bool operator!=(const QLatin1String &other) const { return !(*this == other); }
+    bool operator!=(QLatin1String other) const { return !(*this == other); }
     bool isNull() const { return m_string.isNull(); }
     bool isEmpty() const { return !m_length; }
     int size() const { return m_length; }