diff --git a/macros.pyproject b/macros.pyproject
index ceaf13e..7fec2cf 100644
--- a/macros.pyproject
+++ b/macros.pyproject
@@ -105,6 +105,7 @@ fi
 
 %tox(e:) %{expand:\\\
 TOX_TESTENV_PASSENV="${TOX_TESTENV_PASSENV:-*}" \\
+PYTHONDONTWRITEBYTECODE=1 \\
 PATH="%{buildroot}%{_bindir}:$PATH" \\
 PYTHONPATH="${PYTHONPATH:-%{buildroot}%{python3_sitearch}:%{buildroot}%{python3_sitelib}}" \\
 HOSTNAME="rpmbuild" \\
diff --git a/pyproject-rpm-macros.spec b/pyproject-rpm-macros.spec
index 5de233e..71dad2e 100644
--- a/pyproject-rpm-macros.spec
+++ b/pyproject-rpm-macros.spec
@@ -6,7 +6,7 @@ License:        MIT
 
 # Keep the version at zero and increment only release
 Version:        0
-Release:        32%{?dist}
+Release:        33%{?dist}
 
 # Macro files
 Source001:      macros.pyproject
@@ -97,6 +97,9 @@ export HOSTNAME="rpmbuild"  # to speedup tox in network-less mock, see rhbz#1856
 %license LICENSE
 
 %changelog
+* Fri Nov 27 2020 Miro Hrončok <mhroncok@redhat.com> - 0-33
+- Pass PYTHONDONTWRITEBYTECODE=1 to %%tox to avoid packaged PYTEST bytecode
+
 * Tue Nov 03 2020 Miro Hrončok <mhroncok@redhat.com> - 0-32
 - Allow multiple -e in %%pyproject_buildrequires
 - Fixes: rhbz#1886509