diff --git a/streamlines.h b/streamlines.h
index 354d2817fae003499bae0bc01dca314862b819e0..e38c3900ef8fac1964ffa32eef862e928aa86619 100644
--- a/streamlines.h
+++ b/streamlines.h
@@ -227,7 +227,8 @@ namespace TRACT{
     void reset_beenhere2(const bool& forwardflag,const bool& backwardflag);
 
     void update_matrix3();
-  
+    void reset_beenhere3();
+
     void update_maskmatrix(){} //not written yet
     
     void save_total(const int& keeptotal);