diff --git a/app/views/layouts/project.html.haml b/app/views/layouts/project.html.haml
index 2049b204956..d03d5e2ca6a 100644
--- a/app/views/layouts/project.html.haml
+++ b/app/views/layouts/project.html.haml
@@ -6,7 +6,7 @@
 - content_for :scripts_body_top do
   - project = @target_project || @project
   - if @project_wiki && @page
-    - markdown_preview_path = namespace_project_wiki_markdown_preview_path(project.namespace, project, params[:id])
+    - markdown_preview_path = namespace_project_wiki_markdown_preview_path(project.namespace, project, @page.title)
   - else
     - markdown_preview_path = markdown_preview_namespace_project_path(project.namespace, project)
   - if current_user