diff --git a/selftest/parallel.sh b/selftest/parallel.sh
index 49ec458..d05a3ef 100755
--- a/selftest/parallel.sh
+++ b/selftest/parallel.sh
@@ -24,4 +24,4 @@ export OPENSSL_CONF=/non-existing-file
 # https://bugs.python.org/issue38815
 
 $PYTHON -m test.pythoninfo
-$PYTHON -m test -wW -j$JOBS $X
+xvfb-run $PYTHON -m test -u all -wW -j$JOBS $X
diff --git a/tests.yml b/tests.yml
index 97acbc2..b6350a7 100644
--- a/tests.yml
+++ b/tests.yml
@@ -82,3 +82,4 @@
     - python3-debug
     - python3-rpm-macros
     - marshalparser
+    - xorg-x11-server-Xvfb