diff --git a/index.js b/index.js
index 85dabbb..b22d50e 100644
--- a/index.js
+++ b/index.js
@@ -124,11 +124,11 @@ function _supportsColor(haveStream, {streamIsTTY, sniffFlags = true} = {}) {
 	}
 
 	if ('CI' in env) {
-		if ('GITHUB_ACTIONS' in env || 'GITEA_ACTIONS' in env) {
+		if (['GITHUB_ACTIONS', 'GITEA_ACTIONS', 'CIRCLECI'].some(key => key in env)) {
 			return 3;
 		}
 
-		if (['TRAVIS', 'CIRCLECI', 'APPVEYOR', 'GITLAB_CI', 'BUILDKITE', 'DRONE'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
+		if (['TRAVIS', 'APPVEYOR', 'GITLAB_CI', 'BUILDKITE', 'DRONE'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
 			return 1;
 		}
 
diff --git a/test.js b/test.js
index 4de3180..6ce6fbe 100644
--- a/test.js
+++ b/test.js
@@ -191,10 +191,10 @@ test('return true if `TRAVIS` is in env', async t => {
 	t.truthy(result.stdout);
 });
 
-test('return true if `CIRCLECI` is in env', async t => {
+test('return level 3 if `CIRCLECI` is in env', async t => {
 	process.env = {CI: true, CIRCLECI: true};
 	const result = await importMain();
-	t.truthy(result.stdout);
+	t.is(result.stdout.level, 3);
 });
 
 test('return true if `APPVEYOR` is in env', async t => {