diff --git a/src/Mailgun/Mailgun.php b/src/Mailgun/Mailgun.php
index 6777801..4ade4fc 100644
--- a/src/Mailgun/Mailgun.php
+++ b/src/Mailgun/Mailgun.php
@@ -96,7 +96,7 @@ class Mailgun{
             return hash_equals($hmac, $sig);
         }
         else {
-            return ($hmac == $sig);
+            return ($hmac === $sig);
         }
     }