diff --git a/src/_bentoml_impl/worker/service.py b/src/_bentoml_impl/worker/service.py
index d1349134e0..1ada4edd52 100644
--- a/src/_bentoml_impl/worker/service.py
+++ b/src/_bentoml_impl/worker/service.py
@@ -85,7 +85,7 @@
 @click.option(
     "--timeout-keep-alive",
     type=int,
-    default=None,
+    default=5,
     help="Close Keep-Alive connections if no new data is received within this timeout.",
 )
 @click.option(
diff --git a/src/bentoml_cli/serve.py b/src/bentoml_cli/serve.py
index af78244e40..beb992e0e1 100644
--- a/src/bentoml_cli/serve.py
+++ b/src/bentoml_cli/serve.py
@@ -192,9 +192,7 @@ def cli():
     @click.option(
         "--timeout-keep-alive",
         type=int,
-        default=None,
         help="Close Keep-Alive connections if no new data is received within this timeout.",
-        show_default=True,
         hidden=True,
     )
     @click.option(
diff --git a/src/bentoml_cli/start.py b/src/bentoml_cli/start.py
index 0a86774a28..e37da708e0 100644
--- a/src/bentoml_cli/start.py
+++ b/src/bentoml_cli/start.py
@@ -139,7 +139,6 @@ def cli():
     @click.option(
         "--timeout-keep-alive",
         type=int,
-        default=None,
         help="Close Keep-Alive connections if no new data is received within this timeout.",
     )
     @click.option(
diff --git a/src/bentoml_cli/worker/http_api_server.py b/src/bentoml_cli/worker/http_api_server.py
index 79fa7abe57..31ddc54d57 100644
--- a/src/bentoml_cli/worker/http_api_server.py
+++ b/src/bentoml_cli/worker/http_api_server.py
@@ -86,7 +86,7 @@
 @click.option(
     "--timeout-keep-alive",
     type=click.INT,
-    default=None,
+    default=5,
     help="Close Keep-Alive connections if no new data is received within this timeout.",
 )
 @click.option(