diff --git a/wfobj.py b/wfobj.py
index 6e90984..5a80ff5 100755
--- a/wfobj.py
+++ b/wfobj.py
@@ -74,7 +74,7 @@ class WFObj(object):
                 if len(parts[1:]) == 3:
                     # face is a triangle
                     add_face(*parts[1:])
-                elif len(parts[1:]) > 4:
+                elif len(parts[1:]) == 4:
                     # split the quad into two triangles
                     add_face(*parts[1:3])
                     add_face(parts[1], parts[3], parts[4])