diff --git a/app/services/proforma_service/convert_exercise_to_task.rb b/app/services/proforma_service/convert_exercise_to_task.rb
index ce861120..27836f91 100644
--- a/app/services/proforma_service/convert_exercise_to_task.rb
+++ b/app/services/proforma_service/convert_exercise_to_task.rb
@@ -88,7 +88,7 @@ module ProformaService
     def task_file(file)
       task_file = Proforma::TaskFile.new(
         id: file.id,
-        filename: file.path.present? && file.path != '.' ? ::File.join(file.path, file.name_with_extension) : file.name_with_extension,
+        filename: filename(file),
         usage_by_lms: file.read_only ? 'display' : 'edit',
         visible: file.hidden ? 'no' : 'yes',
         internal_description: file.role || 'regular_file'
@@ -97,6 +97,10 @@ module ProformaService
       task_file
     end
 
+    def filename(file)
+      file.path.present? && file.path != '.' ? ::File.join(file.path, file.name_with_extension) : file.name_with_extension
+    end
+
     def add_content_to_task_file(file, task_file)
       if file.native_file.present?
         file = ::File.new(file.native_file.file.path, 'r')