diff --git a/tests/image-stream/archive-hooks/zip.spec.js b/tests/image-stream/archive-hooks/zip.spec.js
index 40730d05..27c5fa94 100644
--- a/tests/image-stream/archive-hooks/zip.spec.js
+++ b/tests/image-stream/archive-hooks/zip.spec.js
@@ -20,11 +20,12 @@ const m = require('mochainon');
 const path = require('path');
 const zipHooks = require('../../../lib/image-stream/archive-hooks/zip');
 const utils = require('../../../lib/image-stream/utils');
+const tester = require('../tester');
 const ZIP_PATH = path.join(__dirname, '..', 'data', 'zip');
 
 describe('ImageStream: Archive hooks: ZIP', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getEntries()', function() {
 
diff --git a/tests/image-stream/bz2.spec.js b/tests/image-stream/bz2.spec.js
index e0ca4828..99f5fd1e 100644
--- a/tests/image-stream/bz2.spec.js
+++ b/tests/image-stream/bz2.spec.js
@@ -27,7 +27,7 @@ const tester = require('./tester');
 
 describe('ImageStream: BZ2', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('compression method', function() {
 
diff --git a/tests/image-stream/dmg.spec.js b/tests/image-stream/dmg.spec.js
index feaa72fe..1b52283f 100644
--- a/tests/image-stream/dmg.spec.js
+++ b/tests/image-stream/dmg.spec.js
@@ -27,7 +27,7 @@ const tester = require('./tester');
 
 describe('ImageStream: DMG', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('compression method', function() {
 
diff --git a/tests/image-stream/gz.spec.js b/tests/image-stream/gz.spec.js
index 0d950bfa..f934327b 100644
--- a/tests/image-stream/gz.spec.js
+++ b/tests/image-stream/gz.spec.js
@@ -27,7 +27,7 @@ const tester = require('./tester');
 
 describe('ImageStream: GZ', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getFromFilePath()', function() {
 
diff --git a/tests/image-stream/img.spec.js b/tests/image-stream/img.spec.js
index 8823fc97..1015e3fc 100644
--- a/tests/image-stream/img.spec.js
+++ b/tests/image-stream/img.spec.js
@@ -26,7 +26,7 @@ const tester = require('./tester');
 
 describe('ImageStream: IMG', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getFromFilePath()', function() {
 
diff --git a/tests/image-stream/iso.spec.js b/tests/image-stream/iso.spec.js
index d1d1a8da..ae7c888e 100644
--- a/tests/image-stream/iso.spec.js
+++ b/tests/image-stream/iso.spec.js
@@ -26,7 +26,7 @@ const tester = require('./tester');
 
 describe('ImageStream: ISO', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getFromFilePath()', function() {
 
diff --git a/tests/image-stream/tester.js b/tests/image-stream/tester.js
index ff5ddb80..64ee1428 100644
--- a/tests/image-stream/tester.js
+++ b/tests/image-stream/tester.js
@@ -43,6 +43,8 @@ const deleteIfExists = (file) => {
   });
 };
 
+exports.DEFAULT_IMAGE_TESTS_TIMEOUT = 20000;
+
 exports.expectError = function(file, errorMessage, errorDetail) {
   it('should be rejected with an error', function() {
     return imageStream.getFromFilePath(file).catch((error) => {
diff --git a/tests/image-stream/xz.spec.js b/tests/image-stream/xz.spec.js
index 4de46f9f..962681b4 100644
--- a/tests/image-stream/xz.spec.js
+++ b/tests/image-stream/xz.spec.js
@@ -27,7 +27,7 @@ const tester = require('./tester');
 
 describe('ImageStream: XZ', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getFromFilePath()', function() {
 
diff --git a/tests/image-stream/zip.spec.js b/tests/image-stream/zip.spec.js
index 2621246e..58eb2984 100644
--- a/tests/image-stream/zip.spec.js
+++ b/tests/image-stream/zip.spec.js
@@ -27,7 +27,7 @@ const tester = require('./tester');
 
 describe('ImageStream: ZIP', function() {
 
-  this.timeout(20000);
+  this.timeout(tester.DEFAULT_IMAGE_TESTS_TIMEOUT);
 
   describe('.getFromFilePath()', function() {