diff --git a/mod/forum/templates/inpage_reply.mustache b/mod/forum/templates/inpage_reply.mustache
index de8970c382a..de616588fb0 100644
--- a/mod/forum/templates/inpage_reply.mustache
+++ b/mod/forum/templates/inpage_reply.mustache
@@ -55,7 +55,7 @@
                 </button>
                 {{#canreplyprivately}}
                 <div class="form-check form-check-inline">
-                    <input type="checkbox" class="form-check-input" id="private-reply" title="{{#str}} privatereply, forum {{/str}}" name="privatereply"/>
+                    <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>
                 </div>
                 {{/canreplyprivately}}
@@ -65,4 +65,4 @@
             </div>
         </form>
     </div>
-</div>
\ No newline at end of file
+</div>