diff --git a/packages/@aws-cdk/aws-synthetics/lib/runtime.ts b/packages/@aws-cdk/aws-synthetics/lib/runtime.ts
index 11679f43d8bcc..10c7fb566a2e6 100644
--- a/packages/@aws-cdk/aws-synthetics/lib/runtime.ts
+++ b/packages/@aws-cdk/aws-synthetics/lib/runtime.ts
@@ -122,7 +122,7 @@ export class Runtime {
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-3.4
    */
-   public static readonly SYNTHETICS_NODEJS_PUPPETEER_3_4 = new Runtime('syn-nodejs-puppeteer-3.4', RuntimeFamily.NODEJS);
+  public static readonly SYNTHETICS_NODEJS_PUPPETEER_3_4 = new Runtime('syn-nodejs-puppeteer-3.4', RuntimeFamily.NODEJS);
 
   /**
    * `syn-python-selenium-1.0` includes the following:
diff --git a/packages/@aws-cdk/aws-synthetics/test/canary.test.ts b/packages/@aws-cdk/aws-synthetics/test/canary.test.ts
index 4998a52757779..aee1ba78cd134 100644
--- a/packages/@aws-cdk/aws-synthetics/test/canary.test.ts
+++ b/packages/@aws-cdk/aws-synthetics/test/canary.test.ts
@@ -304,7 +304,7 @@ test('Schedule can be set with Cron', () => {
       handler: 'index.handler',
       code: synthetics.Code.fromInline('/* Synthetics handler code */'),
     }),
-    runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_4,
+    runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_3_3,
   });
 
   // THEN