diff --git a/dlp/system-test/redact.test.js b/dlp/system-test/redact.test.js
index 5b88d6e062..e149b12874 100644
--- a/dlp/system-test/redact.test.js
+++ b/dlp/system-test/redact.test.js
@@ -42,9 +42,9 @@ function readImage(filePath) {
 }
 
 async function getImageDiffPercentage(image1Path, image2Path) {
-  let image1 = await readImage(image1Path);
-  let image2 = await readImage(image2Path);
-  let diff = new PNG({width: image1.width, height: image1.height});
+  const image1 = await readImage(image1Path);
+  const image2 = await readImage(image2Path);
+  const diff = new PNG({width: image1.width, height: image1.height});
 
   const diffPixels = pixelmatch(
     image1.data,
diff --git a/dlp/system-test/templates.test.js b/dlp/system-test/templates.test.js
index 19902e2e37..92761e44c8 100644
--- a/dlp/system-test/templates.test.js
+++ b/dlp/system-test/templates.test.js
@@ -20,7 +20,7 @@ const tools = require('@google-cloud/nodejs-repo-tools');
 const uuid = require(`uuid`);
 
 const cmd = `node templates.js`;
-let templateName = '';
+const templateName = '';
 
 const INFO_TYPE = `PERSON_NAME`;
 const MIN_LIKELIHOOD = `VERY_LIKELY`;