diff --git a/lib/main.js b/lib/main.js
index b2a2a725..17e6b671 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -552,9 +552,11 @@ so you can easily test run multiple events.
     // Warn if not building on 64-bit linux
     const arch = process.platform + '.' + process.arch
     if (arch !== 'linux.x64' && !program.dockerImage) {
-      console.warn('Warning!!! You are building on a platform that is not 64-bit Linux (%s). ' +
-        'If any of your Node dependencies include C-extensions, they may not work as expected in the ' +
-        'Lambda environment.\n\n', arch)
+      console.warn(`Warning!!! You are building on a platform that is not 64-bit Linux (${arch}).
+If any of your Node dependencies include C-extensions, \
+they may not work as expected in the Lambda environment.
+
+`)
     }
 
     const codeDirectory = this._codeDirectory()