diff --git a/mrdna/readers/cadnano_segments.py b/mrdna/readers/cadnano_segments.py
index bc4a50f967c9f274dfdeb512d3a4096c778690e3..205ad5708de9b064284769a76713e85feea6e84d 100644
--- a/mrdna/readers/cadnano_segments.py
+++ b/mrdna/readers/cadnano_segments.py
@@ -318,7 +318,7 @@ class cadnano_part(SegmentModel):
                             split_regions.append( (z1,z2) )
                             z1 = z2+1
                     z2 = zid2
-                    if z2 > z1: split_regions.append( (z1,z2) )
+                    split_regions.append( (z1,z2) )
 
             # if hid == 43:
             #     import pdb