diff --git a/dev-tools/scripts/jenkins.build.ref.guide.sh b/dev-tools/scripts/jenkins.build.ref.guide.sh
index 95aa892b374..ccc14876191 100755
--- a/dev-tools/scripts/jenkins.build.ref.guide.sh
+++ b/dev-tools/scripts/jenkins.build.ref.guide.sh
@@ -5,7 +5,8 @@
 # under solr/solr-ref-guide: "ant clean build-site build-pdf".
 #
 # The following will be downloaded and installed into $HOME/.rvm/:
-# RVM, Ruby, and Ruby gems jekyll, jekyll-asciidoc, and pygments.rb.
+# RVM, Ruby, and Ruby gems jekyll, asciidoctor, jekyll-asciidoc, 
+# and pygments.rb.
 #
 # The script expects to be run in the top-level project directory.
 #
@@ -58,9 +59,9 @@ echoRun "rvm $RUBY_VERSION@$GEMSET"      # Activate this project's gemset
 
 # Install gems in the gemset.  Param --force disables dependency conflict detection.
 echoRun "gem install --force --version 3.5.0 jekyll"
+echoRun "gem install --force --version 1.5.6.2 asciidoctor"
 echoRun "gem install --force --version 2.1.0 jekyll-asciidoc"
 echoRun "gem install --force --version 1.1.2 pygments.rb"
-echoRun "gem install --force --version 1.5.6.2 asciidoctor"
 
 cd solr/solr-ref-guide