1 files changed, 2 insertions, 2 deletions
diff --git a/apt-pkg/contrib/progress.h b/apt-pkg/contrib/progress.h
index d0b1f5f94..20caf4cdf 100644
--- a/apt-pkg/contrib/progress.h
+++ b/apt-pkg/contrib/progress.h
@@ -59,9 +59,9 @@ class OpProgress
    
    void Progress(unsigned long Current);
    void SubProgress(unsigned long SubTotal);
-   void SubProgress(unsigned long SubTotal,string Op);
+   void SubProgress(unsigned long SubTotal,const string &Op);
    void OverallProgress(unsigned long Current,unsigned long Total,
-			unsigned long Size,string Op);
+			unsigned long Size,const string &Op);
    virtual void Done() {};
    
    OpProgress();