diff --git a/dist/1.x/ByteBeat.js b/dist/1.x/ByteBeat.js
index 2903496..016ea45 100644
--- a/dist/1.x/ByteBeat.js
+++ b/dist/1.x/ByteBeat.js
@@ -1,4 +1,4 @@
-/* ByteBeat@1.0.13, license MIT */
+/* ByteBeat@1.0.15, license MIT */
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
   typeof define === 'function' && define.amd ? define(factory) :
@@ -297,9 +297,7 @@
     }
 
     static s_fnHeader = (function() {
-      const keys = {
-        'import': true,
-      };
+      const keys = {};
       const windowKeep = new Set([
         'parseInt',
         'parseFloat',
@@ -392,6 +390,7 @@
           return Object.prototype.hasOwnProperty.call(obj, p1) ? (name + p1) : str;
         }
         x = x.replace(/\bint\b/g, 'floor');
+        x = x.replace(/\bimport\b/g, 'notimport');
         x = x.replace(/(?:extra\.)?(\w+)/g, function(substr, p1) {
           return replacer(substr, extra, p1, 'extra.');
         });
diff --git a/dist/1.x/ByteBeat.module.js b/dist/1.x/ByteBeat.module.js
index c03419e..db4d53f 100644
--- a/dist/1.x/ByteBeat.module.js
+++ b/dist/1.x/ByteBeat.module.js
@@ -1,4 +1,4 @@
-/* ByteBeat@1.0.13, license MIT */
+/* ByteBeat@1.0.15, license MIT */
 class WrappingStack {
   constructor(stackSize = 256) {
     let sp = 0;
@@ -291,9 +291,7 @@ class ByteBeatCompiler {
   }
 
   static s_fnHeader = (function() {
-    const keys = {
-      'import': true,
-    };
+    const keys = {};
     const windowKeep = new Set([
       'parseInt',
       'parseFloat',
@@ -386,6 +384,7 @@ class ByteBeatCompiler {
         return Object.prototype.hasOwnProperty.call(obj, p1) ? (name + p1) : str;
       }
       x = x.replace(/\bint\b/g, 'floor');
+      x = x.replace(/\bimport\b/g, 'notimport');
       x = x.replace(/(?:extra\.)?(\w+)/g, function(substr, p1) {
         return replacer(substr, extra, p1, 'extra.');
       });
diff --git a/package-lock.json b/package-lock.json
index e8eec90..a0ff2a2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "bytebeat.js",
-  "version": "1.0.13",
+  "version": "1.0.15",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "bytebeat.js",
-      "version": "1.0.13",
+      "version": "1.0.15",
       "license": "MIT",
       "devDependencies": {
         "eslint": "^8.23.1",
diff --git a/package.json b/package.json
index d74bb88..1ccbf2c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bytebeat.js",
-  "version": "1.0.13",
+  "version": "1.0.15",
   "description": "a bytebeat library",
   "module": "src/ByteBeatNode.js",
   "scripts": {
diff --git a/src/ByteBeatCompiler.js b/src/ByteBeatCompiler.js
index e916233..a10dbcb 100644
--- a/src/ByteBeatCompiler.js
+++ b/src/ByteBeatCompiler.js
@@ -244,9 +244,7 @@ export default class ByteBeatCompiler {
   }
 
   static s_fnHeader = (function() {
-    const keys = {
-      'import': true,
-    };
+    const keys = {};
     const windowKeep = new Set([
       'parseInt',
       'parseFloat',
@@ -339,6 +337,7 @@ export default class ByteBeatCompiler {
         return Object.prototype.hasOwnProperty.call(obj, p1) ? (name + p1) : str;
       }
       x = x.replace(/\bint\b/g, 'floor');
+      x = x.replace(/\bimport\b/g, 'notimport');
       x = x.replace(/(?:extra\.)?(\w+)/g, function(substr, p1) {
         return replacer(substr, extra, p1, 'extra.');
       });