diff --git a/src/encryption/MPQEncryption.php b/src/encryption/MPQEncryption.php
index 2dd1c9e..c6888ad 100644
--- a/src/encryption/MPQEncryption.php
+++ b/src/encryption/MPQEncryption.php
@@ -62,7 +62,7 @@ static function DecryptStream($stream, $datalen, $key, $outFile)
 
         for($i = 0; $i < $datalen; $i++) 
         {
-            $seed = (int)($seed + self::$CryptTable[0x400 + ($key & 0xFF)]);
+            $seed = uPlus($seed, self::$CryptTable[0x400 + ($key & 0xFF)]);
             $ch = unpack("V", $data[$i * 4] . $data[($i * 4) + 1] . $data[($i * 4) + 2] . $data[($i * 4) + 3])[1] ^ (int)($key + $seed);
 
             $key = (((~$key) << 0x15) + 0x11111111) | (rShift($key,0x0B));
@@ -135,4 +135,4 @@ function uPlus($o1, $o2)
 // right shift without preserving the sign(leftmost) bit
 function rShift($num,$bits) { return (($num >> 1) & 0x7FFFFFFF) >> ($bits - 1); }
 
-?>
\ No newline at end of file
+?>