diff --git a/packages/benchpress/src/webdriver/chrome_driver_extension.ts b/packages/benchpress/src/webdriver/chrome_driver_extension.ts
index 2297d8b5a6..ab9f29afb4 100644
--- a/packages/benchpress/src/webdriver/chrome_driver_extension.ts
+++ b/packages/benchpress/src/webdriver/chrome_driver_extension.ts
@@ -86,7 +86,7 @@ export class ChromeDriverExtension extends WebDriverExtension {
         .then((entries) => {
           const events: PerfLogEvent[] = [];
           entries.forEach((entry: any) => {
-            const message = JSON.parse(entry['message'])['message'];
+            const message = (JSON.parse(entry['message']) as {message: any})['message'];
             if (message['method'] === 'Tracing.dataCollected') {
               events.push(message['params']);
             }
diff --git a/packages/benchpress/src/webdriver/ios_driver_extension.ts b/packages/benchpress/src/webdriver/ios_driver_extension.ts
index f2bad64b33..df85000561 100644
--- a/packages/benchpress/src/webdriver/ios_driver_extension.ts
+++ b/packages/benchpress/src/webdriver/ios_driver_extension.ts
@@ -44,7 +44,7 @@ export class IOsDriverExtension extends WebDriverExtension {
         .then((entries) => {
           const records: any[] = [];
           entries.forEach((entry: any) => {
-            const message = JSON.parse(entry['message'])['message'];
+            const message = (JSON.parse(entry['message']) as {message: any})['message'];
             if (message['method'] === 'Timeline.eventRecorded') {
               records.push(message['params']['record']);
             }
diff --git a/packages/benchpress/test/reporter/json_file_reporter_spec.ts b/packages/benchpress/test/reporter/json_file_reporter_spec.ts
index d8621e7374..a7943a4a48 100644
--- a/packages/benchpress/test/reporter/json_file_reporter_spec.ts
+++ b/packages/benchpress/test/reporter/json_file_reporter_spec.ts
@@ -50,7 +50,7 @@ import {Injector, JsonFileReporter, MeasureValues, Options, SampleDescription} f
                  [mv(0, 0, {'a': 3, 'b': 6}), mv(1, 1, {'a': 5, 'b': 9})]);
          const regExp = /somePath\/someId_\d+\.json/;
          expect(loggedFile['filename'].match(regExp) != null).toBe(true);
-         const parsedContent = JSON.parse(loggedFile['content']);
+         const parsedContent = JSON.parse(loggedFile['content']) as any;
          expect(parsedContent).toEqual({
            'description': {
              'id': 'someId',