diff --git a/python-pypet.spec b/python-pypet.spec
index 7108db9..7df3e56 100644
--- a/python-pypet.spec
+++ b/python-pypet.spec
@@ -15,7 +15,7 @@ of your simulations and analyses becomes a piece of cake!}
 
 Name:           python-%{pypi_name}
 Version:        0.5.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Parameter exploration toolbox
 
 License:        BSD
@@ -85,7 +85,7 @@ rm -rf doc/build/html/{.doctrees,.buildinfo} -vf
 # https://github.com/SmokinCaterpillar/pypet/issues/56
 %if %{with tests}
 # Memory issues on s390x: OverflowError: Python int too large to convert to C int
-%if "%{_build_arch}" == "s390x"
+%if "%{_host_cpu}" == "s390x"
 echo "Skip tests on s390x"
 %else
 PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} pypet/tests/all_single_core_tests.py
@@ -103,6 +103,9 @@ PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} pypet/tests/all_single_co
 %doc doc/build/html examples/
 
 %changelog
+* Sat May 22 2021 Ankur Sinha <ankursinha AT fedoraproject DOT org> - 0.5.1-3
+- Correctly detect host builder cpu
+
 * Sat May 22 2021 Ankur Sinha <ankursinha AT fedoraproject DOT org> - 0.5.1-2
 - Use correct macro for build arch