diff --git a/azure-storage-common/src/Common/Internal/Utilities.php b/azure-storage-common/src/Common/Internal/Utilities.php
index 5765e4f5..0747d6ee 100644
--- a/azure-storage-common/src/Common/Internal/Utilities.php
+++ b/azure-storage-common/src/Common/Internal/Utilities.php
@@ -612,7 +612,7 @@ public static function endsWith($haystack, $needle, $ignoreCase = false)
             return true;
         }
 
-        return (substr($haystack, -$length) === $needle);
+        return (substr((string) $haystack, -$length) === $needle);
     }
 
     /**