diff --git a/config/excel.php b/config/excel.php
index c69768585c2d..8a480ff8dd93 100644
--- a/config/excel.php
+++ b/config/excel.php
@@ -188,7 +188,7 @@ return array(
         | having the appropriate fonts installed.
         |
         */
-        'autosize-method'             => constant('\PHPExcel_Shared_Font::AUTOSIZE_METHOD_'.env('EXCEL_AUTOSIZE_MODE')),
+        'autosize-method'             => constant('\PHPExcel_Shared_Font::AUTOSIZE_METHOD_' . env('EXCEL_AUTOSIZE_MODE', 'APPROX')),
 
         /*
         |--------------------------------------------------------------------------