diff --git a/conf/defaults.ini b/conf/defaults.ini
index e25fb0c1715..f59a5dbeb44 100644
--- a/conf/defaults.ini
+++ b/conf/defaults.ini
@@ -113,7 +113,7 @@ network = "tcp"
 address = "127.0.0.1:10000"
 use_tls = false
 cert_file =
-key_file =
+cert_key =
 # this will log the request and response for each unary gRPC call
 enable_logging = false
 
diff --git a/conf/sample.ini b/conf/sample.ini
index ed0233c1a29..8fcce01b2fc 100644
--- a/conf/sample.ini
+++ b/conf/sample.ini
@@ -114,7 +114,7 @@
 ;address = "127.0.0.1:10000"
 ;use_tls = false
 ;cert_file =
-;key_file =
+;cert_key =
 ;max_recv_msg_size =
 ;max_send_msg_size =
 # this will log the request and response for each unary gRPC call