diff --git a/manifests/swh/deploy/webapp/icinga_checks.pp b/manifests/swh/deploy/webapp/icinga_checks.pp
index b63720fb..a40a2161 100644
--- a/manifests/swh/deploy/webapp/icinga_checks.pp
+++ b/manifests/swh/deploy/webapp/icinga_checks.pp
@@ -1,48 +1,48 @@
 class profile::swh::deploy::webapp::icinga_checks {
   $vhost_name = $::profile::swh::deploy::webapp::vhost_name
   $vhost_ssl_port = $::profile::swh::deploy::webapp::vhost_ssl_port
   $icinga_checks_file = '/etc/icinga2/conf.d/exported-checks.conf'
 
   $checks = {
     'counters'      => {
       http_uri    => '/api/1/stat/counters/',
       http_string => '\"content\":',
     },
     'content known' => {
       http_uri    => '/api/1/content/known/search/',
       http_post   => 'q=8624bcdae55baeef00cd11d5dfcfa60f68710a02',
       http_string => '\"found\":true',
     },
     'content end to end' => {
       http_uri    => '/browse/content/4dfc4478b1d5f7388b298fdfc06802485bdeae0c/',
       http_string => 'PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2',
     },
     'directory end to end' => {
       http_uri               => '/browse/directory/977fc4b98c0e85816348cebd3b12026407c368b6/',
       http_linespan          => true,
       http_expect_body_regex => 'Doc.*Grammar.*Include.*Lib.*Mac.*Misc.*Modules.*Objects.*PC.*PCbuild.*LICENSE.*README.rst',
     },
     'revision end to end' => {
       http_uri               => '/browse/revision/f1b94134a4b879bc55c3dacdb496690c8ebdc03f/',
       http_linespan          => true,
-      http_expect_body_regex => '-:"Allocate the output vlc pictures with dimensions padded,.*as requested by the decoder \(for alignments\)."',
+      http_expect_body_regex => '-:"Allocate the output vlc pictures with dimensions padded,.*as requested by the decoder \\(for alignments\\)."',
     },
   }
 
   each($checks) |$name, $args| {
     @@::icinga2::object::service {"swh-webapp ${name} ${::fqdn}":
       service_name  => "swh webapp ${name}",
       import        => ['generic-service'],
       host_name     => $::fqdn,
       check_command => 'http',
       vars          => {
         http_address => $vhost_name,
         http_vhost   => $vhost_name,
         http_port    => $vhost_ssl_port,
         http_ssl     => true,
       } + $args,
       target        => $icinga_checks_file,
       tag           => 'icinga2::exported',
     }
   }
 }