diff --git a/pythran.spec b/pythran.spec
index f20725c..abe3bd0 100644
--- a/pythran.spec
+++ b/pythran.spec
@@ -49,15 +49,8 @@ BuildRequires:  python3-scipy
 
 # these packages are not included in RHEL
 %if %{undefined rhel}
-# Running tests in serial makes memory errors, which occur in some tests on
-# 32-bit architectures, more reproducible, and makes the output when they occur
-# less confusing: we tend to get individual test failures rather than a pytest
-# INTERNALERROR.
-%if 0%{?__isa_bits} != 32
 # this is used for supporting -n auto in %%pytest
 BuildRequires:  python3-pytest-xdist
-%global use_pytest_xdist 1
-%endif
 # this is only used to test integration with ipython
 BuildRequires:  /usr/bin/ipython
 %endif
@@ -155,6 +148,14 @@ k="$k and not test_setup_bdist_install3"
 k="$k and not test_setup_build3"
 k="$k and not test_setup_sdist_install3"
 
+# Don’t run tests in parallel on 32-bit architecutres. RRunning tests in serial
+# makes memory errors, which occur in some tests on 32-bit architectures, more
+# reproducible, and makes the output when they occur less confusing: we tend to
+# get individual test failures rather than a pytest INTERNALERROR.
+%if %{undefined rhel} && 0%{?__isa_bits} != 32
+%global use_pytest_xdist 1
+%endif
+
 %pytest %{?use_pytest_xdist:-n auto} -k "$k"