diff --git a/python-oauthlib.spec b/python-oauthlib.spec
index 5cf45e4..6b00b6b 100644
--- a/python-oauthlib.spec
+++ b/python-oauthlib.spec
@@ -48,6 +48,9 @@ very little effort.
 %pyproject_save_files oauthlib
 
 %check
+# enable SHA-1 signatures for RSA tests
+# also see https://github.com/pyca/cryptography/pull/6931 and rhbz#2060343
+export OPENSSL_ENABLE_SHA1_SIGNATURES=yes
 %{pytest}
 
 %files -n python3-oauthlib -f %{pyproject_files}