diff --git a/lib/CurlRequest.php b/lib/CurlRequest.php
index 4cb335f..44e183b 100644
--- a/lib/CurlRequest.php
+++ b/lib/CurlRequest.php
@@ -152,7 +152,7 @@ protected static function processRequest($ch, $url)
             },
             
             function () {
-                usleep(250000);
+                throw new Exception\ThrottleException("Could not get lock on API resource in Redis.");
             });
 
             if (isset($output)) {
diff --git a/lib/Exception/ThrottleException.php b/lib/Exception/ThrottleException.php
new file mode 100644
index 0000000..e16900a
--- /dev/null
+++ b/lib/Exception/ThrottleException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace PHPShopify\Exception;
+
+class ThrottleException extends \Exception
+{
+}
\ No newline at end of file