diff --git a/devops-service/lib/executors/server_executor.rb b/devops-service/lib/executors/server_executor.rb
index 2b21580..ff49db3 100644
--- a/devops-service/lib/executors/server_executor.rb
+++ b/devops-service/lib/executors/server_executor.rb
@@ -258,7 +258,7 @@ module Devops
         @out << "\nRun chef-client on '#{@server.chef_node_name}'\n"
         cmd = "chef-client --no-color"
         if deploy_info["use_json_file"]
-          deploy_info.delete["use_json_file"]
+          deploy_info.delete("use_json_file")
           @out << "Build information:\n"
           json = JSON.pretty_generate(deploy_info)
           @out << json