diff --git a/addons/website_slides/controllers/main.py b/addons/website_slides/controllers/main.py
index 27fd663cb31..085eab7d5a8 100644
--- a/addons/website_slides/controllers/main.py
+++ b/addons/website_slides/controllers/main.py
@@ -118,7 +118,7 @@ class WebsiteSlides(WebsiteProfile):
         elif tags:
             domain = expression.AND([domain, [('tag_ids', 'in', tags.ids)]])
 
-        if slide_type and 'nbr_%ss' % slide_type in request.env['slide.channel']:
+        if slide_type and 'nbr_%s' % slide_type in request.env['slide.channel']:
             domain = expression.AND([domain, [('nbr_%s' % slide_type, '>', 0)]])
         return domain