diff --git a/src/py/flwr/server/server.py b/src/py/flwr/server/server.py
index 5e8ea8cf4943..c0c0029afc9f 100644
--- a/src/py/flwr/server/server.py
+++ b/src/py/flwr/server/server.py
@@ -183,6 +183,7 @@ def evaluate_round(
             client_instructions,
             max_workers=self.max_workers,
             timeout=timeout,
+            group_id=server_round,
         )
         log(
             DEBUG,
@@ -232,6 +233,7 @@ def fit_round(
             client_instructions=client_instructions,
             max_workers=self.max_workers,
             timeout=timeout,
+            group_id=server_round,
         )
         log(
             DEBUG,