diff --git a/contributing/samples/a2a_root/agent.py b/contributing/samples/a2a_root/agent.py
index c913a6fad..6667de00b 100755
--- a/contributing/samples/a2a_root/agent.py
+++ b/contributing/samples/a2a_root/agent.py
@@ -20,5 +20,5 @@
     description=(
         "Helpful assistant that can roll dice and check if numbers are prime."
     ),
-    agent_card=f"http://localhost:8001/{AGENT_CARD_WELL_KNOWN_PATH}",
+    agent_card=f"http://localhost:8001{AGENT_CARD_WELL_KNOWN_PATH}",
 )