diff --git a/src/Credentials/GCECredentials.php b/src/Credentials/GCECredentials.php
index 235b34a60..430e6e6a7 100644
--- a/src/Credentials/GCECredentials.php
+++ b/src/Credentials/GCECredentials.php
@@ -100,7 +100,7 @@ class GCECredentials extends CredentialsLoader implements
     /**
      * The metadata path of the project ID.
      */
-    const UNIVERSE_DOMAIN_URI_PATH = 'v1/universe/universe_domain';
+    const UNIVERSE_DOMAIN_URI_PATH = 'v1/universe/universe-domain';
 
     /**
      * The header whose presence indicates GCE presence.
diff --git a/tests/Credentials/GCECredentialsTest.php b/tests/Credentials/GCECredentialsTest.php
index f6d9c2266..a7861d468 100644
--- a/tests/Credentials/GCECredentialsTest.php
+++ b/tests/Credentials/GCECredentialsTest.php
@@ -660,7 +660,7 @@ public function testGetUniverseDomain()
         $httpHandler = function ($request) use (&$timesCalled, $expected) {
             $timesCalled++;
             $this->assertEquals(
-                '/computeMetadata/v1/universe/universe_domain',
+                '/computeMetadata/v1/universe/universe-domain',
                 $request->getUri()->getPath()
             );
             $this->assertEquals(1, $timesCalled, 'should only be called once');
@@ -682,7 +682,7 @@ public function testGetUniverseDomainEmptyStringReturnsDefault()
         // Pretend we are on GCE and mock the MDS returning an empty string for the universe domain.
         $httpHandler = function ($request) {
             $this->assertEquals(
-                '/computeMetadata/v1/universe/universe_domain',
+                '/computeMetadata/v1/universe/universe-domain',
                 $request->getUri()->getPath()
             );
             return new Psr7\Response(200, [], Utils::streamFor(''));