diff --git a/app/controllers/concerns/file_parameters.rb b/app/controllers/concerns/file_parameters.rb
index d3d4be12..f816a296 100644
--- a/app/controllers/concerns/file_parameters.rb
+++ b/app/controllers/concerns/file_parameters.rb
@@ -6,7 +6,7 @@ module FileParameters
       params.reject do |_, file_attributes|
         file = CodeOcean::File.find_by(id: file_attributes[:file_id])
         # avoid that public files from other contexts can be created
-        file.nil? || file.hidden || file.read_only || file.context_id != exercise.id
+        file.nil? || file.hidden || file.read_only || file.context == 'Exercise' && file.context_id != exercise.id
       end
     else
       []