diff --git a/app/models/completion.rb b/app/models/completion.rb
index 251c5c8..01c9c8e 100644
--- a/app/models/completion.rb
+++ b/app/models/completion.rb
@@ -31,5 +31,5 @@ class Completion < ApplicationRecord
 
   validates :time_seconds, presence: true
   validates_numericality_of :time_seconds
-  validates :puzzle_id, uniqueness: { score: :contestant }
+  validates :puzzle_id, uniqueness: { scope: :contestant }
 end