diff --git a/SurfRoughing.cpp b/SurfRoughing.cpp
index a39ddc5..2c89a1a 100644
--- a/SurfRoughing.cpp
+++ b/SurfRoughing.cpp
@@ -1911,7 +1911,7 @@ SurfRoughing::AddPocket( const INTINTVECTOR& vPocket, const Vector3d& vtTool, co
                  // se attacco elica od equivalente di step pieno, devo fare elica o similari solo sulla parte con materiale
                   if ( nSubType != SURFROU_SUB_ONEWAY  &&
                        nSubType != SURFROU_SUB_ZIGZAG  &&
-                       ! bIsSubStep  &&
+                       nBasicStep > 0  &&  ! bIsSubStep  &&
                        ( GetLeadInType() == POCKET_LI_ZIGZAG  ||
                          GetLeadInType() == POCKET_LI_HELIX  ||
                          GetLeadInType() == POCKET_LI_GLIDE)) {