diff --git a/monaco-patches/0003-fix-add-basic-language-contribution-as-entry.patch b/monaco-patches/0003-fix-add-basic-language-contribution-as-entry.patch
new file mode 100644
index 00000000..8935eecf
--- /dev/null
+++ b/monaco-patches/0003-fix-add-basic-language-contribution-as-entry.patch
@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Lo=C3=AFc=20Mangeonjean?= <loic@coderpad.io>
+Date: Tue, 25 Nov 2025 19:06:58 +0100
+Subject: [PATCH] fix: add basic language contribution as entry
+
+to make sure it exists in the output
+---
+ build/esm/rollup.config.mjs | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/build/esm/rollup.config.mjs b/build/esm/rollup.config.mjs
+index 37b08bd5..1e18bb2f 100644
+--- a/build/esm/rollup.config.mjs
++++ b/build/esm/rollup.config.mjs
+@@ -27,6 +27,7 @@ export default defineConfig({
+ 		edcoreMain: join(root, './src/editor/edcore.main.ts'),
+ 		editorApi: join(root, './src/editor/editor.api.ts'),
+ 		editorWorker: join(root, './src/editor/editor.worker.ts'),
++		basiclanguages: join(root, './src/basic-languages/monaco.contribution.ts'),
+ 		...getNlsEntryPoints(),
+ 	},
+ 
diff --git a/rollup/rollup.monaco.ts b/rollup/rollup.monaco.ts
index da39643e..c978b2af 100644
--- a/rollup/rollup.monaco.ts
+++ b/rollup/rollup.monaco.ts
@@ -194,8 +194,8 @@ export default rollup.defineConfig([
                     default: './' + worker
                   }
                 },
-                main: 'index.js',
-                module: 'index.js',
+                main: './' + main,
+                module: './' + main,
                 dependencies: {
                   'monaco-editor': `npm:${EDITOR_API_PACKAGE_NAME}@^${pkg.version}`,
                   ...dependencies
@@ -215,13 +215,9 @@ export default rollup.defineConfig([
         ]
       }
     })
-  )),
-  {
+  )), {
     input: {
-      index: path.resolve(BASIC_LANGUAGE_DIR, '_.contribution.js')
-    },
-    treeshake: {
-      preset: 'smallest'
+      index: path.resolve(BASIC_LANGUAGE_DIR, 'monaco.contribution.js')
     },
     output: {
       minifyInternalExports: false,