diff --git a/python-numpy.changes b/python-numpy.changes
index 71b7a3c..6c2018b 100644
--- a/python-numpy.changes
+++ b/python-numpy.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Feb 14 19:51:20 UTC 2025 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Avoid writing non-deterministic .pyc files during build
+  for reproducible builds (jsc#PED-12137)
+
 -------------------------------------------------------------------
 Thu Oct 24 12:21:00 UTC 2024 - Daniel Garcia <daniel.garcia@suse.com>
 
diff --git a/python-numpy.spec b/python-numpy.spec
index 9630901..cec80ff 100644
--- a/python-numpy.spec
+++ b/python-numpy.spec
@@ -201,6 +201,7 @@ chmod -x \
 rm -f PKG-INFO
 
 %build
+export PYTHONDONTWRITEBYTECODE=1
 %define _lto_cflags %{nil}
 %if %{with hpc}
 %hpc_setup