diff --git a/sio/workers/test/test_executors.py b/sio/workers/test/test_executors.py
index 233a20f..995c49d 100644
--- a/sio/workers/test/test_executors.py
+++ b/sio/workers/test/test_executors.py
@@ -449,6 +449,7 @@ def test_inwer(inwer, in_file, use_sandboxes, callback):
     with TemporaryCwd():
         env = {
             'in_file': in_file,
+            'in_file_name': os.path.basename(in_file),
             'exe_file': inwer_bin,
             'use_sandboxes': use_sandboxes,
             'inwer_output_limit': SMALL_OUTPUT_LIMIT,