diff --git a/bibtexbrowser.php b/bibtexbrowser.php
index 8263679..802b8d5 100755
--- a/bibtexbrowser.php
+++ b/bibtexbrowser.php
@@ -477,7 +477,7 @@ class BibtexbrowserBibDB {
 
     if ($finalkey!='url') $formatedvalue = xtrim(latex2html($entryvalue));
     else $formatedvalue = trim($entryvalue);
-    $this->currentEntry->setField($finalkey,$formatedvalue);
+    $this->currentEntry->setField(strtolower($finalkey),$formatedvalue);
   }
 
   function setEntryType($entrytype) {