diff --git a/core/tests/test_pm3argparse.py b/core/tests/test_pm3argparse.py
index f7e9ff7bce47a59a17d5bd68220c4cf5e6e041c6..0e0d617c98734c9348cae38e24015a779077871e 100644
--- a/core/tests/test_pm3argparse.py
+++ b/core/tests/test_pm3argparse.py
@@ -5,10 +5,7 @@ Testing our own little argument parser.
 import unittest
 import tempfile
 import gzip
-try:
-    import ujson as json
-except ImportError:
-    import json
+import json
 import ost
 from promod3.core import pm3argparse