diff --git a/generate-moz-grammars/generate-mozjs.sh b/generate-moz-grammars/generate-mozjs.sh
new file mode 100755
index 000000000..854d335b9
--- /dev/null
+++ b/generate-moz-grammars/generate-mozjs.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+# This script updates the mozjs grammar automatically.
+#
+# Usage: ./generate-moz-grammars/generate-mozjs.sh
+
+# FIXME we need to remove this line once we are going to use
+# the tree-sitter-javascript bindings
+# Get the tree-sitter-javascript submodule version
+TS_JS_VERSION=`git submodule status tree-sitter-javascript | awk '{ print $1 }'`
+
+# Enter the mozjs directory
+pushd tree-sitter-mozjs
+
+# Create tree-sitter-javascript directory
+mkdir -p tree-sitter-javascript
+
+# Enter tree-sitter-javascript directory
+pushd tree-sitter-javascript
+
+# Shallow clone tree-sitter-javascript to a specific revision
+git init
+git remote add origin https://github.com/tree-sitter/tree-sitter-javascript.git
+git fetch --depth 1 origin $TS_JS_VERSION
+git checkout FETCH_HEAD
+
+# Exit tree-sitter-javascript directory
+popd
+
+# Init npm
+npm init -y
+
+# Install a small module that lets the parser be used from Node
+npm install --save nan
+
+# Install the Tree-sitter CLI
+npm install --save-dev tree-sitter-cli
+
+# Generate moz-cpp grammar
+./node_modules/.bin/tree-sitter generate
+
+# Delete node_modules
+rm -rf node_modules
+
+# Delete package files
+rm -rf package-lock.json package.json
+
+# Delete tree-sitter-javascript directory
+rm -rf tree-sitter-javascript
+
+# Exit tree-sitter-mozjs directory
+popd
+
+# Enter enums directory
+pushd enums
+
+# Recreate the grammar for rust-code-analysis
+cargo clean && cargo run -- -lrust -o ../src/languages
+
+# Exit enums directory
+popd
+
+# Format the produced grammars
+cargo fmt
+
+# Run rust code-analysis to verify if everything works correctly and to
+# update the Cargo.lock
+cargo test --workspace
diff --git a/tree-sitter-mozjs/grammar.js b/tree-sitter-mozjs/grammar.js
index d0bb165b2..93ed87beb 100644
--- a/tree-sitter-mozjs/grammar.js
+++ b/tree-sitter-mozjs/grammar.js
@@ -1,4 +1,4 @@
-const JS = require("../tree-sitter-javascript/grammar.js")
+const JS = require("./tree-sitter-javascript/grammar.js")
 
 module.exports = grammar(JS, {
   name: 'mozjs',