diff --git a/src/PhpSpreadsheet/Shared/StringHelper.php b/src/PhpSpreadsheet/Shared/StringHelper.php
index b266fb29..d6a00e8a 100644
--- a/src/PhpSpreadsheet/Shared/StringHelper.php
+++ b/src/PhpSpreadsheet/Shared/StringHelper.php
@@ -113,7 +113,7 @@ class StringHelper
             "\x1B :" => chr(10),
             "\x1B ;" => chr(11),
             "\x1B <" => chr(12),
-            "\x1B :" => chr(13),
+            "\x1B =" => chr(13),
             "\x1B >" => chr(14),
             "\x1B ?" => chr(15),
             "\x1B!0" => chr(16),