diff --git a/client/src/app/core/auth/auth.service.ts b/client/src/app/core/auth/auth.service.ts
index cadf78c0c..341ff8637 100644
--- a/client/src/app/core/auth/auth.service.ts
+++ b/client/src/app/core/auth/auth.service.ts
@@ -160,7 +160,7 @@ Ensure you have correctly configured PeerTube (config/ directory), in particular
       response_type: 'code',
       grant_type: 'password',
       scope: 'upload',
-      username,
+      username: (username || '').trim(),
       password
     }