diff --git a/src/bookworm b/src/bookworm
index c6981ea..06ddccd 100755
--- a/src/bookworm
+++ b/src/bookworm
@@ -117,7 +117,7 @@ else
 fi
 
 
-firefox_lang=$(echo $LANG | cut -d. -f1 | tr "_" "-")
+firefox_lang=$(echo $LANG | cut -d_ -f1)
 echo $firefox_lang