diff --git a/jobs/templates/swh-pipeline.groovy.j2 b/jobs/templates/swh-pipeline.groovy.j2
--- a/jobs/templates/swh-pipeline.groovy.j2
+++ b/jobs/templates/swh-pipeline.groovy.j2
@@ -106,7 +106,7 @@
 
       steps {
         sh '''
-        if tox -a | grep -qx sphinx
+        if tox -a | grep -x sphinx >/dev/null
         then
           tox -e sphinx
         else