diff --git a/masque/pattern.py b/masque/pattern.py
index d801b5d..7c5f8c3 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -1318,7 +1318,6 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
             out_port_name = next(iter(set(other.ports.keys()) - set(map_in.values())))
             map_out = {out_port_name: next(iter(map_in.keys()))}
 
-
         self.check_ports(other.ports.keys(), map_in, map_out)
         translation, rotation, pivot = self.find_transform(
             other,