diff --git a/package.json b/package.json
index d6e9f95bcf..457049e09c 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,8 @@
     "test": "env NODE_PATH=$NODE_PATH:./assets/js/src mocha --require tests/javascript/babel_register.js tests/javascript/**/*.spec.js",
     "check-types": "tsc --noEmit",
     "storybook": "start-storybook -s ./ -p 8083",
-    "build-storybook": "build-storybook"
+    "build-storybook": "build-storybook",
+    "postinstall": "node packages_postinstall.js"
   },
   "dependencies": {
     "@babel/runtime": "^7.10.2",
diff --git a/packages_postinstall.js b/packages_postinstall.js
new file mode 100644
index 0000000000..4d636370e9
--- /dev/null
+++ b/packages_postinstall.js
@@ -0,0 +1,17 @@
+/**
+ * This is a temporary fix of a bug in @wordpress/block-editor@4.1.0 package.
+ * It is already fixed and merged in master https://github.com/WordPress/gutenberg/commit/1e43db126e33e13173f9af9113cb9f39f9be7f1f
+ * We can remove this fix after upgrading the package to a version newer than 4.1.0
+ */
+const fs = require('fs');
+const fileToFix = './node_modules/@wordpress/block-editor/build-module/components/button-block-appender/index.js';
+fs.readFile(fileToFix, 'utf8', (err,data) => {
+  if (err) {
+    return console.log(err);
+  }
+  var result = data.replace(/" ", inserterButton, " "/g, 'inserterButton');
+
+  fs.writeFile(fileToFix, result, 'utf8', (err) => {
+    if (err) return console.log(err);
+  });
+});