diff --git a/plugins/ps/functions b/plugins/ps/functions
index a951b8b4e..df19f2565 100755
--- a/plugins/ps/functions
+++ b/plugins/ps/functions
@@ -6,7 +6,7 @@ source "$PLUGIN_AVAILABLE_PATH/config/functions"
 
 get_cmd_from_procfile() {
   declare desc="parse cmd from app Procfile"
-  declare APP="$1" PROC_TYPE="$2" PORT="$3"
+  declare APP="$1" PROC_TYPE="$2" PORT="${3:-5000}"
   local DOKKU_PROCFILE="$DOKKU_ROOT/$APP/DOKKU_PROCFILE"
   local COMMAND
   verify_app_name "$APP"