diff --git a/controllers/API.php b/controllers/API.php
index 172e32d..62bcec1 100644
--- a/controllers/API.php
+++ b/controllers/API.php
@@ -103,7 +103,7 @@ class API {
     foreach($xpath->query('//a[@href]') as $href) {
       $url = $href->getAttribute('href');
       $domain = parse_url($url, PHP_URL_HOST);
-      if($url == $target || $domain == $target_domain || str_ends_with($domain, $target_domain)) {
+      if($url == $target || $domain == $target_domain || str_ends_with($domain, '.' . $target_domain)) {
         $found[$url] = null;
       }
     }
diff --git a/tests/APITest.php b/tests/APITest.php
index 526ce28..c82bcbe 100644
--- a/tests/APITest.php
+++ b/tests/APITest.php
@@ -214,6 +214,16 @@ class APITest extends PHPUnit_Framework_TestCase {
     $this->_assertNotQueued('http://source.example.com/multipletest', 'http://source.example.com/relativelink');
   }
 
+  public function testTargetDomainSubdomainCheck() {
+    $this->_createExampleAccount();
+
+    $response = $this->webmention(['token'=>'a','source'=>'http://source.example.com/multipletest','target_domain'=>'ample.com']);
+    $body = $response->getContent();
+    $this->assertEquals(400, $response->getStatusCode());
+    $data = json_decode($response->getContent());
+    $this->assertEquals('no_link_found', $data->error);
+  }
+
   public function testStatusNotFound() {
     $this->_createExampleAccount();