diff --git a/src/Project/Controllers/DataSourceController.cs b/src/Project/Controllers/DataSourceController.cs
index ff42b05c814f1d99ab0a9aa4a21c27a57491a030..3e3a1ed2882a27be2d0bb4044ada9b0e93d4501f 100644
--- a/src/Project/Controllers/DataSourceController.cs
+++ b/src/Project/Controllers/DataSourceController.cs
@@ -230,7 +230,7 @@ namespace Coscine.Api.Project.Controllers
             else
             {
                 // If the path is null, an empty string is added.
-                string url = $"{_configuration.GetString("coscine/global/waterbutler_url")}{resource.Type.DisplayName.ToLower()}/{path}";
+                string url = $"{_configuration.GetString("coscine/global/waterbutler_url")}{resource.Type.DisplayName.ToLower()}{path}";
 
                 var request = new HttpRequestMessage(HttpMethod.Delete, url);
                 request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", authHeader);