diff --git a/Import3dm.cpp b/Import3dm.cpp
index ed4584f..731870a 100644
--- a/Import3dm.cpp
+++ b/Import3dm.cpp
@@ -1161,6 +1161,7 @@ Import3dm::ConvertBrep( const ON_Brep* onBrep, const bool bForceTriMesh)
                   pSurfBezNew->Invert() ;
 
                pSurfBezNew->RemoveCollapsedSpans() ;
+               pSurfBezNew->LimitSurfToTrimmedRegion() ;
 
 #if SAVEREVOLVESURF
                SaveGeoObj( pSurfBezNew->Clone(), "D:\\Temp\\bezier\\import3dm\\revolve_surf\\surf_ok.nge") ;