diff --git a/src/setup-tools.test.ts b/src/setup-tools.test.ts
index 96680b339..a9cdde407 100644
--- a/src/setup-tools.test.ts
+++ b/src/setup-tools.test.ts
@@ -4,8 +4,11 @@ import nock from 'nock';
 import * as path from 'path';
 
 import * as setupTools from './setup-tools';
+import {silenceDebugOutput} from './testing-utils';
 import * as util from './util';
 
+silenceDebugOutput(test);
+
 test('download codeql bundle cache', async t => {
 
     await util.withTmpDir(async tmpDir => {
diff --git a/src/util.test.ts b/src/util.test.ts
index e530b2aca..83b9ba116 100644
--- a/src/util.test.ts
+++ b/src/util.test.ts
@@ -1,8 +1,11 @@
 import test from 'ava';
 import * as fs from 'fs';
 
+import {silenceDebugOutput} from './testing-utils';
 import * as util from './util';
 
+silenceDebugOutput(test);
+
 test('getToolNames', t => {
   const input = fs.readFileSync(__dirname + '/../src/testdata/tool-names.sarif', 'utf8');
   const toolNames = util.getToolNames(input);