diff --git a/scripts/mbedtls_dev/test_case.py b/scripts/mbedtls_dev/test_case.py
index a6ed8fc90d..c476d1ee9a 100644
--- a/scripts/mbedtls_dev/test_case.py
+++ b/scripts/mbedtls_dev/test_case.py
@@ -17,6 +17,7 @@
 # limitations under the License.
 
 import binascii
+import os
 import sys
 from typing import Any, Iterable, List, Optional
 import typing_extensions #pylint: disable=import-error
@@ -98,7 +99,7 @@ def write_data_file(filename: str,
     If the file already exists, it is overwritten.
     """
     if caller is None:
-        caller = sys.argv[0]
+        caller = os.path.basename(sys.argv[0])
     with open(filename, 'w') as out:
         out.write('# Automatically generated by {}. Do not edit!\n'
                   .format(caller))