diff --git a/src/PhpSpreadsheet/Shared/OLERead.php b/src/PhpSpreadsheet/Shared/OLERead.php
index 2d0a7986..182b130f 100644
--- a/src/PhpSpreadsheet/Shared/OLERead.php
+++ b/src/PhpSpreadsheet/Shared/OLERead.php
@@ -302,6 +302,11 @@ class OLERead
      */
     private static function getInt4d($data, $pos)
     {
+        $len = strlen($data);
+        if ($len < $pos + 4) {
+            $data .= str_repeat("\0", $pos + 4 - $len);
+        }
+
         // FIX: represent numbers correctly on 64-bit system
         // http://sourceforge.net/tracker/index.php?func=detail&aid=1487372&group_id=99160&atid=623334
         // Hacked by Andreas Rehm 2006 to ensure correct result of the <<24 block on 32 and 64bit systems