diff --git a/lib/binding_web/exports.json b/lib/binding_web/exports.json
index bc794480..dfc9ff54 100644
--- a/lib/binding_web/exports.json
+++ b/lib/binding_web/exports.json
@@ -35,6 +35,7 @@
   "_strcmp",
   "_strncpy",
   "_tolower",
+  "_towlower",
   "_towupper",
   "_stderr",