diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
index 6d1b261..29ca0ba 100644
--- a/src/Message/AbstractRequest.php
+++ b/src/Message/AbstractRequest.php
@@ -113,7 +113,7 @@ public function generateSignature($data)
             if (strcasecmp($key, 'Brq_signature') === 0) {
                 continue;
             }
-            $str .= $key.'='.$value;
+            $str .= $key.'='.urldecode($value);
         }
 
         return sha1($str.$this->getSecretKey());