diff --git a/benchmarks/benchmark_serving.py b/benchmarks/benchmark_serving.py
index 966181de2d67d..497232382d35c 100644
--- a/benchmarks/benchmark_serving.py
+++ b/benchmarks/benchmark_serving.py
@@ -320,6 +320,7 @@ async def get_request(
     input_requests = iter(input_requests)
 
     # Calculate scale parameter theta to maintain the desired request_rate.
+    assert burstiness > 0, f"A positive burstiness factor is expected, but given {burstiness}."
     theta = 1.0 / (request_rate * burstiness)
 
     for request in input_requests: