diff --git a/combo/apps/wcs/models.py b/combo/apps/wcs/models.py
index c4a3e2eb..fe9f89e9 100644
--- a/combo/apps/wcs/models.py
+++ b/combo/apps/wcs/models.py
@@ -147,6 +147,8 @@ class WcsBlurpMixin(object):
         sources = []
         for slug, wcs_site in wcs_sites.items():
             url = wcs_site.get('url')
+            if not url.endswith('/'):
+                url += '/'
             source = {
                 'slug': slug,
                 'parser_type': 'json',