diff --git a/SPECS/scipy.spec b/SPECS/scipy.spec
index 11d3a84..4f8f9e3 100644
--- a/SPECS/scipy.spec
+++ b/SPECS/scipy.spec
@@ -16,7 +16,7 @@
 Summary:    Scientific Tools for Python
 Name:       scipy
 Version:    1.0.0
-Release:    20%{?dist}
+Release:    21%{?dist}
 
 Group:      Development/Libraries
 # BSD -- whole package except:
@@ -241,6 +241,9 @@ env CFLAGS="$RPM_OPT_FLAGS" \
 
 
 %check
+# Do not create -PYTEST.pyc files
+export PYTHONDONTWRITEBYTECODE=1
+
 # Skip all tests on s390x because they hangs unexpectedly and randomly
 # and pytest-timeout has no effect. Note that the outcome of the tests
 # is ignored anyway so by disabling the test for s390x we are not doing
@@ -286,6 +289,10 @@ popd
 %endif # with python3
 
 %changelog
+* Thu Mar 04 2021 Nikola Forró <nforro@redhat.com> - 1.0.0-21
+- Do not create -PYTEST.pyc files
+- Resolves: rhbz#1934199
+
 * Tue Jun 04 2019 Nikola Forró <nforro@redhat.com> - 1.0.0-20
 - Fix python{2,3}-six Requires
 - Resolves: rhbz#1709599