diff --git a/webservice/components/request_adapter.py b/webservice/components/request_adapter.py
index 9399729c..4b348e2e 100644
--- a/webservice/components/request_adapter.py
+++ b/webservice/components/request_adapter.py
@@ -68,7 +68,7 @@ def _get_url(self, url=None, url_params=None, **kwargs):
             url = self.collection.url
         elif not url.startswith(self.collection.url):
             if not url.startswith("http"):
-                url = f"{self.collection.url.rstrip('/')/{url.lstrip('/')"
+                url = f"{self.collection.url.rstrip('/')}/{url.lstrip('/')}"
             else:
                 # TODO: if url is given, we should validate the domain
                 # to avoid abusing a webservice backend for different calls.