diff --git a/libsrc/geom2d/genmesh2d.cpp b/libsrc/geom2d/genmesh2d.cpp
index 43193e3a..b42440ce 100644
--- a/libsrc/geom2d/genmesh2d.cpp
+++ b/libsrc/geom2d/genmesh2d.cpp
@@ -457,9 +457,9 @@ namespace netgen
     for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
       if ( (*mesh)[si].si > maxsegmentindex) maxsegmentindex = (*mesh)[si].si;
 
-    mesh->SetNBCNames(maxsegmentindex+1);
+    mesh->SetNBCNames(maxsegmentindex);
 
-    for ( int sindex = 0; sindex <= maxsegmentindex; sindex++ )
+    for ( int sindex = 0; sindex < maxsegmentindex; sindex++ )
       mesh->SetBCName ( sindex, geometry.GetBCName( sindex+1 ) );
 
     for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)