diff --git a/jobs/templates/swh-pipeline.groovy.j2 b/jobs/templates/swh-pipeline.groovy.j2
index d491eec..a0b5073 100644
--- a/jobs/templates/swh-pipeline.groovy.j2
+++ b/jobs/templates/swh-pipeline.groovy.j2
@@ -1,138 +1,138 @@
 pipeline {
   {% filter indent(width=2) %}
     {%- include 'includes/agent-docker.groovy.j2' -%}
   {% endfilter %}
 
   environment {
     PHAB_CONDUIT_URL = 'https://forge.softwareheritage.org/api/'
   }
 
   stages {
     stage('Checkout') {
       steps {
         {% filter indent(width=8) %}
           {%- include 'includes/create-phabricator-artifacts.groovy.j2' -%}
         {% endfilter %}
         checkout([
           $class: 'GitSCM',
           branches: [[name: "${params.REVISION}"]],
           doGenerateSubmoduleConfigurations: false,
           extensions: [],
           gitTool: 'Default',
           submoduleCfg: [],
           userRemoteConfigs: [
             [url: 'https://forge.softwareheritage.org/source/{{repo_name}}.git'],
           ],
           browser: [$class: 'Phabricator', repoUrl: 'https://forge.softwareheritage.org', repo: '{{name}}']
         ])
       }
     }
 
     {%- if phabricator_diff %}
     {% filter indent(width=4) %}
       {%- include 'includes/stage-apply-phabricator-diff.groovy.j2' -%}
     {% endfilter %}
     {%- endif %}
 
     stage('Static analysis') {
       parallel {
         stage ('flake8') {
           steps {
             sh '''python3 -m tox -e flake8'''
           }
         }
 
         stage ('mypy') {
           steps {
             sh '''python3 -m tox -e mypy'''
           }
         }
 
         stage ('radon') {
           steps {
             sh  '''
               mkdir -p reports
               python3 -m radon raw --json swh/ > reports/raw_report.json
               python3 -m radon cc  --json swh/ > reports/cc_report.json
               python3 -m radon mi  --json swh/ > reports/mi_report.json
               python3 -m radon hal --json swh/ > reports/hal_report.json
               python3 -m radon cc  --xml  swh/ > reports/cc_report.xml
             '''
           }
           post {
             always {
               // Archive a few report files
               archiveArtifacts(
                 allowEmptyArchive: true,
                 artifacts: 'reports/*',
                 fingerprint: true,
               )
 
               // Warnings NG
               recordIssues(
                 enabledForFailure: true,
                 tools: [
                   ccm(pattern: '**/reports/cc_report.xml'),
                 ],
               )
             }
           }
         }
       }
     } // static analysis
 
     stage('Tests') {
       options {
         timeout(time: 20, unit: 'MINUTES')
       }
 
       parallel {
         {% filter indent(width=8) %}
           {%- include 'includes/stage-python-tests.groovy.j2' -%}
         {% endfilter %}
 
         {%- if do_cypress %}
         {% filter indent(width=8) %}
           {%- include 'includes/stage-cypress-tests.groovy.j2' -%}
         {% endfilter %}
         {%- endif %}
       }
     }
 
     stage('Sphinx documentation') {
       {% filter indent(width=6) %}
         {%- include 'includes/agent-docker-sphinx.groovy.j2' -%}
       {% endfilter %}
 
       steps {
         sh '''
-        if tox -a | grep -qx sphinx
+        if tox -a | grep -x sphinx >/dev/null
         then
           tox -e sphinx
         else
           echo WARNING: no sphinx environment in tox.ini
         fi
         '''
       }
     } // sphinx doc
   } // stages
 
   post {
     always {
       step([$class: 'PhabricatorNotifier',
             commentOnSuccess: true,
             commentWithConsoleLinkOnFailure: true,
             commentFile: '.phabricator-comment',
             commentSize: '1000000',
             preserveFormatting: true,
             processLint: true,
             lintFile: '.phabricator-lint',
             lintFileSize: '1000000',
       ])
     } // always
 
     cleanup {
       cleanWs()
     }
   } // post
 } // pipeline