URL is changing after rewrite with proxy flag

I am running a JIRA server behind a apache web server and using rewrite with proxy flag to serve it.

I have below entry in httpd.conf

#Rewrite rule for JIRA
RewriteCond     %{HTTP_HOST}    ^jira.example.com    [NC]
RewriteRule     ^/(.*)$ http://54.55.56.57:8080/$1    [P]

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But when I access jira.example.com then the URL in my browser changes from jira.example.com to http://54.55.56.57:8080. I am not sure what I am doing wrong. I do not want URL to be changed