diff --git a/src/corelib/kernel/qvariant.h b/src/corelib/kernel/qvariant.h
index a80321b7d4..b5e9deedf0 100644
--- a/src/corelib/kernel/qvariant.h
+++ b/src/corelib/kernel/qvariant.h
@@ -626,7 +626,7 @@ public:
         const_iterator &operator-=(int j);
         const_iterator operator+(int j) const;
         const_iterator operator-(int j) const;
-        friend inline const_iterator operator+(int j, const_iterator k) { return k + j; }
+        friend inline const_iterator operator+(int j, const const_iterator &k) { return k + j; }
     };
 
     friend struct const_iterator;
@@ -680,7 +680,7 @@ public:
         const_iterator &operator-=(int j);
         const_iterator operator+(int j) const;
         const_iterator operator-(int j) const;
-        friend inline const_iterator operator+(int j, const_iterator k) { return k + j; }
+        friend inline const_iterator operator+(int j, const const_iterator &k) { return k + j; }
     };
 
     friend struct const_iterator;