diff --git a/e107_handlers/file_class.php b/e107_handlers/file_class.php
index 334771349..d77298735 100644
--- a/e107_handlers/file_class.php
+++ b/e107_handlers/file_class.php
@@ -848,7 +848,7 @@ class e_file
 		$source = trim($source);
 		$source = strtoupper($source);
 
-		list($val, $unit) = preg_split('#(?<=\d)(?=[a-z])#i', $source);
+		list($val, $unit) = array_pad(preg_split('#(?<=\d)(?=[a-z])#i', $source), 2, '');
 
 		$val = (int) $val;