diff --git a/app/controllers/genotypes_controller.rb b/app/controllers/genotypes_controller.rb
index 2c3ed812..e9caf930 100644
--- a/app/controllers/genotypes_controller.rb
+++ b/app/controllers/genotypes_controller.rb
@@ -73,7 +73,7 @@ def destroy
         
         # delete Uploaded Genotyping-achievement
         @achievement_id = Achievement.find_by_award("Published genotyping").id
-        @to_delete = UserAchievement.find_all_by_achievement_id_and_user_id(@achievement_id, @user.id)
+        @to_delete = UserAchievement.find_by_achievement_id_and_user_id(@achievement_id, @user.id)
         UserAchievement.destroy(@to_delete)
       end
       redirect_to current_user