diff --git a/python/core/qgsvectorlayer.sip b/python/core/qgsvectorlayer.sip
index ae1a7556ab6..5e9cb45cba8 100644
--- a/python/core/qgsvectorlayer.sip
+++ b/python/core/qgsvectorlayer.sip
@@ -596,7 +596,7 @@ public:
       @param uniqueValues out: result list
       @limit maximum number of values to return (-1 if unlimited)
       @note: this method was added in version 1.7*/
-    void uniqueValues( int index, QList<QVariant>& uniqueValues /Out/, int limit );
+    void uniqueValues( int index, QList<QVariant>& uniqueValues /Out/, int limit = -1 );
 
     /**Returns minimum value for an attribute column or invalid variant in case of error
          @note added in 1.7*/