diff --git a/app/models/fluentd/agent/process_operation.rb b/app/models/fluentd/agent/process_operation.rb
index 45eb581..00c4003 100644
--- a/app/models/fluentd/agent/process_operation.rb
+++ b/app/models/fluentd/agent/process_operation.rb
@@ -50,7 +50,6 @@ class Fluentd
 
       def options_to_argv(opts = {})
         argv = ""
-        argv << " --use-v1-config"
         argv << " -c #{opts[:config_file] || config_file}"
         argv << " -d #{opts[:pid_file] || pid_file}"
         argv << " -o #{opts[:log_file] || log_file}"
diff --git a/spec/models/fluentd/agent_spec.rb b/spec/models/fluentd/agent_spec.rb
index 0baef63..eab0d69 100644
--- a/spec/models/fluentd/agent_spec.rb
+++ b/spec/models/fluentd/agent_spec.rb
@@ -18,7 +18,6 @@ describe Fluentd::Agent do
       it { should include("-c #{instance.config_file}") }
       it { should include("-d #{instance.pid_file}") }
       it { should include("-o #{instance.log_file}") }
-      it { should include("--use-v1-config") }
     end
 
     describe "#start" do