diff --git a/README.md b/README.md
index 0fb747231..8d0c293f5 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ profile::accounts:::skel_archives:
 | ------------------------------------------------ | :------------ | :--------------------------------------------- | -------------------------------------------------------------------- |
 | `profile::cvmfs::client::quota_limit` | Integer | Instance local cache directory soft quota (MB) | 4096 |
 | `profile::cvmfs::client::initial_profile` | String | Path to shell script initializing software stack environment variables | Depends on the chosen software stack |
+| `profile::cvmfs::client::extra_site_env_vars` | Hash[String, String] | Map of environment variables that will be exported before sourcing profile shell scripts. | `{ }` |
 | `profile::cvmfs::client::repositories` | Array[String] | List of CVMFS repositories to mount  | Depends on the chosen software stack |
 | `profile::cvmfs::client::alien_cache_repositories`| Array[String] | List of CVMFS repositories that need an alien cache | `[]` |
 | `profile::cvmfs::client::lmod_default_modules`   | Array[String] | List of lmod default modules | Depends on the chosen software stack |
diff --git a/site/profile/manifests/cvmfs.pp b/site/profile/manifests/cvmfs.pp
index 1f25f88b9..3bc6e5d3b 100644
--- a/site/profile/manifests/cvmfs.pp
+++ b/site/profile/manifests/cvmfs.pp
@@ -4,7 +4,7 @@
   Array[String] $repositories,
   Array[String] $lmod_default_modules,
   Array[String] $alien_cache_repositories = [],
-
+  Hash[String, String] $extra_site_env_vars = {},
 ) {
   include consul_template
   include profile::cvmfs::local_user
@@ -84,6 +84,7 @@
       {
         'lmod_default_modules' => $lmod_default_modules,
         'initial_profile'      => $initial_profile,
+        'extra_site_env_vars'  => $extra_site_env_vars,
       }
     ),
   }
diff --git a/site/profile/templates/cvmfs/z-01-site.sh.epp b/site/profile/templates/cvmfs/z-01-site.sh.epp
index 561429daf..462298f9c 100644
--- a/site/profile/templates/cvmfs/z-01-site.sh.epp
+++ b/site/profile/templates/cvmfs/z-01-site.sh.epp
@@ -2,6 +2,11 @@
 
 if [[ $UID -gt <%= $::uid_max %> ]]; then
     export LMOD_SYSTEM_DEFAULT_MODULES="<%= $lmod_default_modules.join(' ') %>"
+
+<% $extra_site_env_vars.each | $key, $value| { -%>
+    export <%= $key %>=<%= $value %>
+<% } -%>
+
     if [[ -r <%= $initial_profile %>  ]]; then
         source <%= $initial_profile %>
     fi