diff --git a/masque/builder/renderpather.py b/masque/builder/renderpather.py
index 86ff83d..ba97fd7 100644
--- a/masque/builder/renderpather.py
+++ b/masque/builder/renderpather.py
@@ -405,7 +405,7 @@ class RenderPather(PortList, PatherMixin):
         self.pattern.ports[portspec] = out_port.copy()
 
         if plug_into is not None:
-            self.plugged({'portspec': plug_into})
+            self.plugged({portspec: plug_into})
 
         return self