diff --git a/libervia/backend/tools/common/uri.py b/libervia/backend/tools/common/uri.py
index c5c9d8bc..e2127959 100644
--- a/libervia/backend/tools/common/uri.py
+++ b/libervia/backend/tools/common/uri.py
@@ -116,6 +116,6 @@ def build_xmpp_uri(type_: Optional[str] = None, **kwargs: str) -> str:
             uri.append("?")
             add_pairs(uri, kwargs)
     else:
-        raise NotImplementedError("{type_} URI are not handled yet".format(type_=type_))
+        raise NotImplementedError(f"{type_} URI are not handled yet".format(type_=type_))
 
     return "".join(uri)