diff --git a/src/Ratchet/WebSocket/Version/Hixie76.php b/src/Ratchet/WebSocket/Version/Hixie76.php
index ab34925..536977b 100644
--- a/src/Ratchet/WebSocket/Version/Hixie76.php
+++ b/src/Ratchet/WebSocket/Version/Hixie76.php
@@ -103,13 +103,7 @@ class Hixie76 implements VersionInterface {
     }
 
     public function generateKeyNumber($key) {
-        if (0 === substr_count($key, ' ')) {
-            return '';
-        }
-
-        $int = (int)preg_replace('[\D]', '', $key) / substr_count($key, ' ');
-
-        return (is_int($int)) ? $int : '';
+        return preg_replace('[\D]', '', $key) / substr_count($key, ' ');
     }
 
     protected function sign($key1, $key2, $code) {
diff --git a/tests/Ratchet/Tests/WebSocket/Version/Hixie76Test.php b/tests/Ratchet/Tests/WebSocket/Version/Hixie76Test.php
index 7107a1b..fecca81 100644
--- a/tests/Ratchet/Tests/WebSocket/Version/Hixie76Test.php
+++ b/tests/Ratchet/Tests/WebSocket/Version/Hixie76Test.php
@@ -31,11 +31,7 @@ class Hixie76Test extends \PHPUnit_Framework_TestCase {
     public static function keyProvider() {
         return array(
             array(179922739, '17  9 G`ZD9   2 2b 7X 3 /r90')
-          , array('', '17  9 G`ZD9   2 2b 7X 3 /r91')
           , array(906585445, '3e6b263  4 17 80')
-          , array('', '3e6b263 4 17 80')
-          , array('', '3e6b63 4 17 80')
-          , array('', '3e6b6341780')
         );
     }