diff --git a/osinaweb/osinacore/templates/details_templates/project-details.html b/osinaweb/osinacore/templates/details_templates/project-details.html
index a124a17e..6f2ad6d3 100644
--- a/osinaweb/osinacore/templates/details_templates/project-details.html
+++ b/osinaweb/osinacore/templates/details_templates/project-details.html
@@ -394,7 +394,7 @@
                     <p class="text-secondosiblue uppercase font-bold">Milestones</p>
                 </div>
 
-                <a href="{% url 'addmilestone' project.id %}" class="h-full">
+                <a href="{% url 'addmilestone' project.project_id %}" class="h-full">
                     <button
                     class="h-full rounded-tr-md px-4 bg-secondosiblue text-gray-200 text-[18px] outline-none border-none cursor-pointer flex justify-center items-center">
                     <i class="fa fa-plus"></i>