diff --git a/tests/phpunit/tests/option/transient.php b/tests/phpunit/tests/option/transient.php
index c8f0b26dea..3dbd79d6d6 100644
--- a/tests/phpunit/tests/option/transient.php
+++ b/tests/phpunit/tests/option/transient.php
@@ -42,6 +42,10 @@ class Tests_Option_Transient extends WP_UnitTestCase {
 			$this->markTestSkipped( 'Not testable in MS: wpmu_create_blog() defines WP_INSTALLING.' );
 		}
 
+		if ( wp_using_ext_object_cache() ) {
+			$this->markTestSkipped( 'Not testable with an external object cache.' );
+		}
+
 		$key = rand_str();
 		$value = rand_str();
 
@@ -67,6 +71,10 @@ class Tests_Option_Transient extends WP_UnitTestCase {
 			$this->markTestSkipped( 'Not testable in MS: wpmu_create_blog() defines WP_INSTALLING.' );
 		}
 
+		if ( wp_using_ext_object_cache() ) {
+			$this->markTestSkipped( 'Not testable with an external object cache.' );
+		}
+
 		$key = rand_str();
 		$value = rand_str();
 		$value2 = rand_str();
@@ -90,6 +98,10 @@ class Tests_Option_Transient extends WP_UnitTestCase {
 	 * @ticket 30380
 	 */
 	function test_nonexistent_key_dont_delete_if_false() {
+		if ( wp_using_ext_object_cache() ) {
+			$this->markTestSkipped( 'Not testable with an external object cache.' );
+		}
+
 		// Create a bogus a transient
 		$key = 'test_transient';
 		set_transient( $key, 'test', 60 * 10 );
@@ -122,6 +134,10 @@ class Tests_Option_Transient extends WP_UnitTestCase {
 			$this->markTestSkipped( 'Not testable in MS: wpmu_create_blog() defines WP_INSTALLING.' );
 		}
 
+		if ( wp_using_ext_object_cache() ) {
+			$this->markTestSkipped( 'Not testable with an external object cache.' );
+		}
+
 		// Create a transient
 		$key = 'test_transient';
 		set_transient( $key, 'test', 60 * 10 );