diff --git a/about.pl b/about.pl
index 55ffc379fb..ba3434184f 100755
--- a/about.pl
+++ b/about.pl
@@ -277,6 +277,10 @@ if ( ! C4::Context->config('tmp_path') ) {
     }
 }
 
+if( ! C4::Context->config('encryption_key') ) {
+    push @xml_config_warnings, { error => 'encryption_key_missing' };
+}
+
 # Test Zebra facets configuration
 if ( !defined C4::Context->config('use_zebra_facets') ) {
     push @xml_config_warnings, { error => 'use_zebra_facets_entry_missing' };
diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
index 30776fc5f9..b05ef269f8 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
@@ -484,6 +484,13 @@
                         The effective temporary directory is '[% config_entry.effective_tmp_dir | html %]'.
                     </td>
                 </tr>
+                [% ELSIF config_entry.error == 'encryption_key_missing' %]
+                <tr>
+                    <th scope="row"><strong>Warning</strong></th>
+                    <td>You are missing the &lt;encryption_key&gt; entry in your koha-conf.xml file.
+                        Please generate a key. We recommend one of at least 32 bytes. (You might use 'pwgen 32' to do so.)
+                    </td>
+                </tr>
                 [% END %]
             [% END %]
             </table>