diff --git a/combo/apps/wcs/models.py b/combo/apps/wcs/models.py
index 20f38589..7e3e0628 100644
--- a/combo/apps/wcs/models.py
+++ b/combo/apps/wcs/models.py
@@ -50,7 +50,7 @@ class WcsFormCell(CellBase):
         if self.formdef_reference:
             wcs_key, form_slug = self.formdef_reference.split(':')
             wcs_site = get_wcs_services().get(wcs_key)
-            forms_response_json = get_wcs_json(wcs_site.get('url') + 'json')
+            forms_response_json = get_wcs_json(wcs_site.get('url'), 'json')
             for form in forms_response_json:
                 slug = form.get('slug')
                 if slug == form_slug:
@@ -86,7 +86,7 @@ class WcsCommonCategoryCell(CellBase):
         if self.category_reference:
             wcs_key, category_slug = self.category_reference.split(':')
             wcs_site = get_wcs_services().get(wcs_key)
-            categories_response_json = get_wcs_json(wcs_site.get('url') + 'categories')
+            categories_response_json = get_wcs_json(wcs_site.get('url'), 'categories')
             for category in categories_response_json.get('data'):
                 slug = category.get('slug')
                 if slug == category_slug:
diff --git a/combo/apps/wcs/utils.py b/combo/apps/wcs/utils.py
index ee885a4f..d9b18fbb 100644
--- a/combo/apps/wcs/utils.py
+++ b/combo/apps/wcs/utils.py
@@ -27,7 +27,10 @@ def get_wcs_services():
         return {}
     return settings.KNOWN_SERVICES.get('wcs')
 
-def get_wcs_json(url):
+def get_wcs_json(wcs_url, path):
+    if not wcs_url.endswith('/'):
+        wcs_url += '/'
+    url = wcs_url + path
     response_json = cache.get(url)
     if response_json is None:
         response_json = requests.get(url, headers={'accept': 'application/json'}).json()
@@ -38,7 +41,7 @@ def get_wcs_options(url):
     references = []
     for wcs_key, wcs_site in get_wcs_services().iteritems():
         site_title = wcs_site.get('title')
-        response_json = get_wcs_json(wcs_site.get('url') + url)
+        response_json = get_wcs_json(wcs_site.get('url'), url)
         if type(response_json) is dict:
             response_json = response_json.get('data')
         for element in response_json: