diff --git a/application/common.php b/application/common.php
index ba27249..f4fb304 100644
--- a/application/common.php
+++ b/application/common.php
@@ -861,7 +861,7 @@ function my_doiToFrag2($data)
                         $suffix = empty($parts[1]) ? 0 : intval($parts[1]);
                         if($prefix > $suffix){
                             $prefixLen = strlen($prefix);
-                            $suffixLen = strlen($sufix);
+                            $suffixLen = strlen($suffix);
                             $missingLen = $prefixLen - $suffixLen;
                             if ($missingLen > 0) {
                                 $fillPart = substr($prefix, 0, $missingLen);