diff --git a/mod/forum/templates/inpage_reply.mustache b/mod/forum/templates/inpage_reply.mustache
index de616588fb0..ddcb978b82e 100644
--- a/mod/forum/templates/inpage_reply.mustache
+++ b/mod/forum/templates/inpage_reply.mustache
@@ -56,7 +56,7 @@
                 {{#canreplyprivately}}
                 <div class="form-check form-check-inline">
                     <input type="checkbox" class="form-check-input" id="private-reply-checkbox-{{uniqid}}" title="{{#str}} privatereply, forum {{/str}}" name="privatereply"/>
-                    <label class="form-check-label" for="private-reply">{{#str}} privatereply, forum {{/str}}</label>
+                    <label class="form-check-label" for="private-reply-checkbox-{{uniqid}}">{{#str}} privatereply, forum {{/str}}</label>
                 </div>
                 {{/canreplyprivately}}
                 <button title="{{#str}} advanced, core {{/str}}" data-action="forum-advanced-reply" class="btn btn-link float-right" type="submit">