diff --git a/lib/galaxy/datatypes/display_applications/parameters.py b/lib/galaxy/datatypes/display_applications/parameters.py
index c5f2a4f74ee3..2eb9423a2a74 100644
--- a/lib/galaxy/datatypes/display_applications/parameters.py
+++ b/lib/galaxy/datatypes/display_applications/parameters.py
@@ -256,19 +256,17 @@ def url(self):
         base_url = self.trans.request.base
         if self.parameter.strip_https and base_url[:5].lower() == "https":
             base_url = f"http{base_url[5:]}"
-        return "{}{}".format(
-            base_url,
-            self.trans.app.url_for(
-                controller="dataset",
-                action="display_application",
-                dataset_id=self._dataset_hash,
-                user_id=self._user_hash,
-                app_name=quote_plus(self.parameter.link.display_application.id),
-                link_name=quote_plus(self.parameter.link.id),
-                app_action=self.action_name,
-                action_param=self._url,
-            ),
+        path = self.trans.app.url_for(
+            controller="dataset",
+            action="display_application",
+            dataset_id=self._dataset_hash,
+            user_id=self._user_hash,
+            app_name=quote_plus(self.parameter.link.display_application.id),
+            link_name=quote_plus(self.parameter.link.id),
+            app_action=self.action_name,
+            action_param=self._url,
         )
+        return f"{base_url.rstrip('/')}/{path.lstrip('/')}"
 
     @property
     def action_name(self):