diff --git a/cinema/models.py b/cinema/models.py
index b5fcb9e0..61795c8d 100644
--- a/cinema/models.py
+++ b/cinema/models.py
@@ -28,9 +28,9 @@ def __str__(self):
 class Movie(models.Model):
     title = models.CharField(max_length=200)
     description = models.TextField()
-    actors = models.ManyToManyField(Actor)
-    genres = models.ManyToManyField(Genre)
-    duration = models.DurationField()
+    duration = models.IntegerField()
+    actors = models.ManyToManyField("Actor", related_name="movies")
+    genres = models.ManyToManyField("Genre", related_name="movies")
 
     def __str__(self):
         return self.title