diff --git a/python-numpy.changes b/python-numpy.changes
index 886fdda..5dc4d7e 100644
--- a/python-numpy.changes
+++ b/python-numpy.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Feb 12 16:55:08 UTC 2025 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Avoid writing non-deterministic .pyc files during build
+  for reproducible builds
+
 -------------------------------------------------------------------
 Fri Nov 22 22:33:50 UTC 2024 - Matej Cepl <mcepl@cepl.eu>
 
diff --git a/python-numpy.spec b/python-numpy.spec
index 264d0e9..e76d201 100644
--- a/python-numpy.spec
+++ b/python-numpy.spec
@@ -204,6 +204,7 @@ chmod -x \
 rm -f PKG-INFO
 
 %build
+export PYTHONDONTWRITEBYTECODE=1
 %define _lto_cflags %{nil}
 %if %{with hpc}
 %hpc_setup