diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
index ea5f917642..7c72af553e 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
@@ -822,7 +822,7 @@ Note that permanent location is a code, and location may be an authval.
             <p>
                 [% IF HTML5MediaSet.is_youtube %]
                     <iframe id="player" type="text/html" width="640" height="360"
-                        src="[% HTML5MediaSet.srcblock %]" frameborder="0"></iframe>
+                        src="[% HTML5MediaSet.srcblock | url %]" frameborder="0"></iframe>
                 [% ELSE %]
                   <[% HTML5MediaParent | html %] controls preload=none>
                     <[% HTML5MediaSet.child | html %] src="[% HTML5MediaSet.srcblock | url %]"[% HTML5MediaSet.typeblock | html %] />
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
index b7bb3b0025..8752824d8a 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt
@@ -957,11 +957,11 @@
                                 <p>
                                     [% IF HTML5MediaSet.is_youtube %]
                                         <iframe id="player" type="text/html" width="640" height="360"
-                                            src="[% HTML5MediaSet.srcblock %]" frameborder="0"></iframe>
+                                            src="[% HTML5MediaSet.srcblock | url %]" frameborder="0"></iframe>
                                     [% ELSE %]
                                         [% SET ctrl_preload = ' controls preload=none' #translatability %]
                                         <[% HTML5MediaParent _ ctrl_preload | html %] >
-                                          <[% HTML5MediaSet.child | html %] src="[% HTML5MediaSet.srcblock | html %]" [% HTML5MediaSet.typeblock | html %] />
+                                          <[% HTML5MediaSet.child | html %] src="[% HTML5MediaSet.srcblock | url %]" [% HTML5MediaSet.typeblock | html %] />
                                           <span>[[% HTML5MediaParent | html %] tag not supported by your browser.]</span>
                                         </[% HTML5MediaParent | html %]>
                                     [% END %]