diff --git a/src/Header/ContentType.php b/src/Header/ContentType.php
index 4ed083b4..6e4a233b 100644
--- a/src/Header/ContentType.php
+++ b/src/Header/ContentType.php
@@ -131,7 +131,7 @@ public function toString()
      */
     public function setType($type)
     {
-        if (! preg_match('/^[a-z-]+\/[a-z0-9.+-]+$/i', $type)) {
+        if (! preg_match('/^[a-z-]+\/[*a-z0-9.+-]+$/i', $type)) {
             throw new Exception\InvalidArgumentException(sprintf(
                 '%s expects a value in the format "type/subtype"; received "%s"',
                 __METHOD__,