diff --git a/app/controllers/tournaments_controller.rb b/app/controllers/tournaments_controller.rb
index 37d376d..cd7ebce 100644
--- a/app/controllers/tournaments_controller.rb
+++ b/app/controllers/tournaments_controller.rb
@@ -124,9 +124,9 @@ class TournamentsController < ApplicationController
   def validate_update_params
     return if only_playoff_teams_amount_changed
 
-    playoff_teams_amount = params['playoff_teams_amount'] || @tournament.playoff_teams_amount
-    instant_finalists_amount = params['instant_finalists_amount'] || @tournament.instant_finalists_amount
-    intermediate_round_participants_amount = params['intermediate_round_participants_amount'] ||
+    playoff_teams_amount = params['playoff_teams_amount'].to_i || @tournament.playoff_teams_amount
+    instant_finalists_amount = params['instant_finalists_amount'].to_i || @tournament.instant_finalists_amount
+    intermediate_round_participants_amount = params['intermediate_round_participants_amount'].to_i ||
                                              @tournament.intermediate_round_participants_amount
 
     return if instant_finalists_amount + (intermediate_round_participants_amount / 2) ==