diff --git a/src/event_handlers/source_code_event_handler.py b/src/event_handlers/source_code_event_handler.py
index aa57777..b426f4a 100644
--- a/src/event_handlers/source_code_event_handler.py
+++ b/src/event_handlers/source_code_event_handler.py
@@ -45,7 +45,7 @@ class FileManager:
 
 
 class SourceCodeEventHandler(EventHandlerBase, SupervisorMixin):
-    def __init__(self, anchor, directory, process_name=None, selected_file=None):
+    def __init__(self, anchor, directory, process_name, selected_file=None):
         super().__init__(anchor)
         self.filemanager = FileManager(directory, selected_file=selected_file)
         self.process_name = process_name