diff --git a/cli.py b/cli.py
index be78e0b..83567a7 100755
--- a/cli.py
+++ b/cli.py
@@ -41,11 +41,10 @@ class Cli:
         self.args = ap.parse_args()
 
     def calculate_ratings(self):
-        ratings = []
         with Pool(processes=cpu_count()) as pool:
-            for image in self.args.images:
-                ratings.append((image, pool.apply_async(self.calculate_rating,
-                                                        (image, self.args.method))))
+            ratings = [(image, pool.apply_async(self.calculate_rating,
+                                                (image, self.args.method)))
+                       for image in self.args.images]
             self.image_ratings = {image: promise.get() for image, promise in ratings}
 
     @staticmethod