diff --git a/poetry/console/commands/show.py b/poetry/console/commands/show.py
index 33217e67427..d1eed3436b8 100644
--- a/poetry/console/commands/show.py
+++ b/poetry/console/commands/show.py
@@ -79,7 +79,7 @@ def handle(self):
 
                 return 0
 
-            required_by = {}  # type: Dict[str, str]
+            required_by = {}
             for locked in locked_packages:
                 dependencies = {d.name: d.pretty_constraint for d in locked.requires}