diff --git a/VolZmapVolume.cpp b/VolZmapVolume.cpp
index 5d4a50a..0bb0b99 100644
--- a/VolZmapVolume.cpp
+++ b/VolZmapVolume.cpp
@@ -2289,7 +2289,7 @@ VolZmap::Comp_5AxisMilling( int nGrid, const PNTVECTOR& ptS, const PNTVECTOR& pt
                   bool bXInclude = false ;
                   IntersLineBezierSurfSet( ptLineStart, vtLineStart, vSurfBez, vIntersX, vSurfX) ;
                   IntersToolLine( ptLineStart, vtLineStart, mi, ti, vSurfBez, vIntersX, vSurfX) ;
-                  if( vIntersX.size() > 0) {
+                  if( vIntersX.size() > 1) {
                      SortGroupInters( vIntersX, vStartEndsX, X_AX) ;
                      if( vStartEndsX.size() == 0)
                         return false ;