diff --git a/package.json b/package.json
index a9f6b18192f..d08dcda5470 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
     "get-port": "^4.2.0",
     "globby": "^9.1.0",
     "husky": "^1.3.1",
+    "is-ci": "^2.0.0",
     "jest": "24.9.0",
     "lerna": "3.19.0",
     "lerna-changelog": "~0.8.2",
diff --git a/packages/react-scripts/scripts/test.js b/packages/react-scripts/scripts/test.js
index 010bc2904a9..0d3f4bbf55d 100644
--- a/packages/react-scripts/scripts/test.js
+++ b/packages/react-scripts/scripts/test.js
@@ -33,6 +33,7 @@ verifyTypeScriptSetup();
 // @remove-on-eject-end
 
 const jest = require('jest');
+const isCI = require('is-ci')
 const execSync = require('child_process').execSync;
 let argv = process.argv.slice(2);
 
@@ -56,7 +57,7 @@ function isInMercurialRepository() {
 
 // Watch unless on CI or explicitly running all tests
 if (
-  !process.env.CI &&
+  !isCI &&
   argv.indexOf('--watchAll') === -1 &&
   argv.indexOf('--watchAll=false') === -1
 ) {