diff --git a/addons/addon-base-raas/packages/serverless-packer/index.js b/addons/addon-base-raas/packages/serverless-packer/index.js
index a669bb070e..801340e451 100644
--- a/addons/addon-base-raas/packages/serverless-packer/index.js
+++ b/addons/addon-base-raas/packages/serverless-packer/index.js
@@ -35,10 +35,10 @@ class ServerlessPackerPlugin {
         usage: 'Build an AMI using packer',
         lifecycleEvents: ['build'],
         options: {
-          file: {
+          files: {
             usage:
               'Override the packer file used to build the AMI' +
-              '(e.g. "--file \'packer.json\'" or "-m \'packer.json\'")',
+              '(e.g. "--files \'packer.json\'" or "-m \'packer.json\'")',
             required: false,
             shortcut: 'f',
           },