diff --git a/lib/binding_web/binding.js b/lib/binding_web/binding.js
index 766abd54..e965992f 100644
--- a/lib/binding_web/binding.js
+++ b/lib/binding_web/binding.js
@@ -11,6 +11,8 @@ const PREDICATE_STEP_TYPE_DONE = 0;
 const PREDICATE_STEP_TYPE_CAPTURE = 1;
 const PREDICATE_STEP_TYPE_STRING = 2;
 
+const LANGUAGE_FUNCTION_REGEX = /^_?tree_sitter_\w+/;
+
 var VERSION;
 var MIN_COMPATIBLE_VERSION;
 var TRANSFER_BUFFER;
@@ -866,7 +868,7 @@ class Language {
       .then(bytes => loadWebAssemblyModule(bytes, {loadAsync: true}))
       .then(mod => {
         const functionName = Object.keys(mod).find(key =>
-          key.includes("tree_sitter_") &&
+          LANGUAGE_FUNCTION_REGEX.test(key) &&
           !key.includes("external_scanner_")
         );
         const languageAddress = mod[functionName]();