diff --git a/lighthouse-core/lib/traces/tracing-processor.js b/lighthouse-core/lib/traces/tracing-processor.js
index f39ea2e5e258..f5381c596087 100644
--- a/lighthouse-core/lib/traces/tracing-processor.js
+++ b/lighthouse-core/lib/traces/tracing-processor.js
@@ -55,8 +55,8 @@ require('../../third_party/traceviewer-js/');
 const traceviewer = global.tr;
 if (typeof atob === 'undefined') {
   // Node doesn't have base64 encode/decode functions available globally so polyfill with buffer
-  traceviewer.b.Base64.atob = input => new Buffer(input).toString('base64')
-  traceviewer.b.Base64.btoa = input => new Buffer(input, 'base64').toString()
+  traceviewer.b.Base64.atob = input => new Buffer(input).toString('base64');
+  traceviewer.b.Base64.btoa = input => new Buffer(input, 'base64').toString();
 }
 
 class TraceProcessor {