diff --git a/src/app.ts b/src/app.ts
index 7a7be19..86d8956 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -1,7 +1,7 @@
 import { createWriteStream, WriteStream } from 'fs';
 import { join } from 'path';
 
-import { MainConfig, SVGOConfig } from './config';
+import { MainConfig, SVGOConfig, OptimizedResponse } from './config';
 import { svgClean } from './modules/svgo.clean';
 import { makeConfig } from './modules/svgo.config';
 
@@ -28,13 +28,25 @@ export class SvgIconset {
     }
 
     svgClean(this.config.source, this.svgoPlugin)
-      .then(files => {
-        createWriteStream(join(process.cwd(), this.config.source, `${this.config.result}-iconset.svg`))
-          .once('open', function (this: WriteStream) {
-            this.write(`<svg>${files}</svg>`);
+      .then(optimizedResponse => {
+        let idx = 0;
+        const ids = optimizedResponse.map(el => el.id);
+        Promise.all(optimizedResponse.map(el => el.optimized))
+          .then(resFiles => {
+            createWriteStream(join(process.cwd(), this.config.source, `${this.config.result}-iconset.svg`))
+              .once('open', function (this: WriteStream) {
+                try {
+                  const data = resFiles.map(res => res.data.replace(/<svg /, `<svg id="${ids[idx]}" `));
+                  this.write(`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">${data.join('')}</svg>`);
+                  idx++;
+                } catch (err) {
+                  console.log('ERROR', err);
+                }
+              })
+              .on('close', () => console.log(`Succesfully written file ${this.config.result}-iconset.svg`))
+              .on('error', () => console.error('Something’s wrong try again'));
           })
-          .on('close', () => console.log(`Succesfully written file ${this.config.result}-iconset.svg`))
-          .on('error', () => console.error('Something’s wrong try again'));
+          .catch(console.error);
       })
       .catch(err => console.error(err));
   }
diff --git a/src/config.d.ts b/src/config.d.ts
index 585617b..7217262 100644
--- a/src/config.d.ts
+++ b/src/config.d.ts
@@ -14,6 +14,16 @@ export interface SvgOptimizeConfig {
   removeViewBox?: boolean
 }
 
+export interface SVGOResponse {
+  data: string;
+  info: { [propname: string]: string }
+}
+
+export interface OptimizedResponse {
+  id: string;
+  optimized: SVGOResponse
+}
+
 export interface MainConfig {
   source: string;
   result: string;
diff --git a/src/modules/svgo.clean.ts b/src/modules/svgo.clean.ts
index b73dd59..09aff2b 100644
--- a/src/modules/svgo.clean.ts
+++ b/src/modules/svgo.clean.ts
@@ -1,7 +1,10 @@
-const SVGO = require('svgo');
-import { readdir } from 'fs';
+import { readdir, readFileSync } from 'fs';
+import { join } from 'path';
 
-export function svgClean(path: string, svgo: typeof SVGO): Promise<SVGElement[]> {
+import { OptimizedResponse } from '../config';
+
+const SVGO = require('svgo');
+export function svgClean(path: string, svgo: typeof SVGO): Promise<OptimizedResponse[]> {
 
   return new Promise((resolve, reject) => {
 
@@ -11,7 +14,13 @@ export function svgClean(path: string, svgo: typeof SVGO): Promise<SVGElement[]>
       }
 
       const files = svgFiles.filter(filename => filename.indexOf('iconset') === -1 && filename.indexOf('.svg') > -1)
-        .map(dirtyFile => svgo.optimize(dirtyFile));
+        .map(dirtyFile => {
+          const filePath = join(path, dirtyFile);
+          return {
+            id: dirtyFile.replace(/.svg/, ''),
+            optimized: svgo.optimize(readFileSync(filePath))
+          };
+        });
 
       return files.length > 0 ? resolve(files) : reject('There are no SVG files to optimize');