diff --git a/tests/interop/nim_libp2p/test_echo_interop.py b/tests/interop/nim_libp2p/test_echo_interop.py
index 598a01d0..45a87a18 100644
--- a/tests/interop/nim_libp2p/test_echo_interop.py
+++ b/tests/interop/nim_libp2p/test_echo_interop.py
@@ -147,6 +147,8 @@ async def run_echo_test(server_addr: str, messages: list[str]):
                 logger.info(f"Got echo: {response}")
                 responses.append(response)
 
+                assert False, "FORCED FAILURE"
+
                 # Verify echo
                 assert message == response, (
                     f"Echo failed: sent {message!r}, got {response!r}"