diff --git a/epy.changes b/epy.changes
index a48f947..7a3ddcf 100644
--- a/epy.changes
+++ b/epy.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Dec 20 11:43:07 UTC 2023 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Do not write non-deterministic .pyc files in tests
+
 -------------------------------------------------------------------
 Sat Mar 04 13:16:37 UTC 2023 - mcepl@cepl.eu
 
diff --git a/epy.spec b/epy.spec
index f094564..680ddc7 100644
--- a/epy.spec
+++ b/epy.spec
@@ -75,6 +75,7 @@ python3 -mpip install --root %{buildroot} --no-warn-script-location \
     build/epy_reader-*-py3-none-any.whl
 
 %check
+export PYTHONDONTWRITEBYTECODE=1
 export PYTHONPATH=%{buildroot}/%{python3_sitelib}
 pytest -v tests