diff --git a/docker/backend/src/mw/schema/vote.cr b/docker/backend/src/mw/schema/vote.cr
index b46b671..591134a 100644
--- a/docker/backend/src/mw/schema/vote.cr
+++ b/docker/backend/src/mw/schema/vote.cr
@@ -24,7 +24,7 @@ module MW
       getter teacher_ids
 
       @[GraphQL::Field]
-      def initialize(@teacher_ids : Array(String))
+      def initialize(@teacher_ids : Array(Int32))
       end
     end
   end