diff --git a/lib/tests/session_redis_test.php b/lib/tests/session_redis_test.php
index 45a17ed15f5e6..8c91a612af211 100644
--- a/lib/tests/session_redis_test.php
+++ b/lib/tests/session_redis_test.php
@@ -283,7 +283,7 @@ public function test_exception_when_connection_attempts_exceeded() {
             $actual = $e->getMessage();
         }
 
-        $expected = 'Failed to connect (try 5 out of 5) to redis at 127.0.0.1:111111';
+        $expected = 'Failed to connect (try 5 out of 5) to redis at ' . TEST_SESSION_REDIS_HOST . ':111111';
         $this->assertDebuggingCalledCount(5);
         $this->assertContains($expected, $actual);
     }