diff --git a/sdk.php b/sdk.php
index cbb2271..e941267 100644
--- a/sdk.php
+++ b/sdk.php
@@ -28,11 +28,11 @@
  * @param string $className
  */
 function hubspot_autoload($className) {
-	if (strpos($className, 'HubSpot_') == 0) {
+	if (strpos($className, 'HubSpot_') === 0) {
 		$className = strtolower(str_replace('HubSpot_', '', $className));
 		$file = 'class.' . $className . '.php';
 		include __DIR__ . DIRECTORY_SEPARATOR . $file;
 	}
 }
 
-spl_autoload_register('hubspot_autoload');
\ No newline at end of file
+spl_autoload_register('hubspot_autoload');