diff --git a/src/components/StickySidebar/StickyResponsiveSidebar.tsx b/src/components/StickySidebar/StickyResponsiveSidebar.tsx
index 51167b36..24b0a06e 100644
--- a/src/components/StickySidebar/StickyResponsiveSidebar.tsx
+++ b/src/components/StickySidebar/StickyResponsiveSidebar.tsx
@@ -6,9 +6,10 @@ import { RedocNormalizedOptions, RedocRawOptions } from '../../services/RedocNor
 import styled, { media, withProps } from '../../styled-components';
 import { OptionsContext } from '../OptionsProvider';
 import { AnimatedChevronButton } from './ChevronSvg';
+import { IS_BROWSER } from '../../utils/index';
 
 let Stickyfill;
-if (typeof window !== 'undefined') {
+if (IS_BROWSER) {
   Stickyfill = require('stickyfill').default;
 }
 
diff --git a/src/services/HistoryService.ts b/src/services/HistoryService.ts
index ab80869d..2ae14c3d 100644
--- a/src/services/HistoryService.ts
+++ b/src/services/HistoryService.ts
@@ -1,6 +1,6 @@
 import { bind, debounce } from 'decko';
 import { EventEmitter } from 'eventemitter3';
-import { isBrowser } from '../utils/';
+import { IS_BROWSER } from '../utils/';
 
 const EVENT = 'hashchange';
 
@@ -18,7 +18,7 @@ class IntHistoryService {
   }
 
   get hash(): string {
-    return isBrowser ? window.location.hash : '';
+    return IS_BROWSER ? window.location.hash : '';
   }
 
   subscribe(cb): () => void {
@@ -35,13 +35,13 @@ class IntHistoryService {
   };
 
   bind() {
-    if (isBrowser) {
+    if (IS_BROWSER) {
       window.addEventListener('hashchange', this.emit, false);
     }
   }
 
   dispose() {
-    if (isBrowser) {
+    if (IS_BROWSER) {
       window.removeEventListener('hashchange', this.emit);
     }
     this.causedHashChange = false;
@@ -54,13 +54,13 @@ class IntHistoryService {
       return;
     }
     if (rewriteHistory) {
-      if (isBrowser) {
+      if (IS_BROWSER) {
         window.history.replaceState(null, '', window.location.href.split('#')[0] + '#' + hash);
       }
       return;
     }
     this.causedHashChange = true;
-    if (isBrowser) {
+    if (IS_BROWSER) {
       window.location.hash = hash;
     }
   }
diff --git a/src/services/OpenAPIParser.ts b/src/services/OpenAPIParser.ts
index 9f2bb96d..1d18a4d4 100644
--- a/src/services/OpenAPIParser.ts
+++ b/src/services/OpenAPIParser.ts
@@ -3,7 +3,7 @@ import { resolve as urlResolve } from 'url';
 
 import { OpenAPIRef, OpenAPISchema, OpenAPISpec, Referenced } from '../types';
 
-import { appendToMdHeading, isBrowser } from '../utils/';
+import { appendToMdHeading, IS_BROWSER } from '../utils/';
 import { JsonPointer } from '../utils/JsonPointer';
 import { isNamedDefinition } from '../utils/openapi';
 import { buildComponentComment, COMPONENT_REGEXP } from './MarkdownRenderer';
@@ -54,7 +54,7 @@ export class OpenAPIParser {
 
     this.spec = spec;
 
-    const href = isBrowser ? window.location.href : '';
+    const href = IS_BROWSER ? window.location.href : '';
     if (typeof specUrl === 'string') {
       this.specUrl = urlResolve(href, specUrl);
     } else {
diff --git a/src/services/ScrollService.ts b/src/services/ScrollService.ts
index 13459028..b184f9f5 100644
--- a/src/services/ScrollService.ts
+++ b/src/services/ScrollService.ts
@@ -1,7 +1,7 @@
 import { bind } from 'decko';
 import * as EventEmitter from 'eventemitter3';
 
-import { isBrowser, querySelector, Throttle } from '../utils';
+import { IS_BROWSER, querySelector, Throttle } from '../utils';
 import { RedocNormalizedOptions } from './RedocNormalizedOptions';
 
 const EVENT = 'scroll';
@@ -11,7 +11,7 @@ export class ScrollService {
   private _emiter: EventEmitter;
   private _prevOffsetY: number = 0;
   constructor(private options: RedocNormalizedOptions) {
-    this._scrollParent = isBrowser ? window : undefined;
+    this._scrollParent = IS_BROWSER ? window : undefined;
     this._emiter = new EventEmitter();
     this.bind();
   }
diff --git a/src/services/SearchStore.ts b/src/services/SearchStore.ts
index 0e1d1165..b806693d 100644
--- a/src/services/SearchStore.ts
+++ b/src/services/SearchStore.ts
@@ -1,11 +1,11 @@
 import { IMenuItem } from './MenuStore';
 import { OperationModel } from './models';
+import { IS_BROWSER } from '../utils/';
 
 let worker;
 
-if (typeof URL !== 'undefined') {
+if (IS_BROWSER) {
   try {
-    // tslint:disable-next-line
     worker = require('workerize-loader?inline&fallback=false!./SearchWorker.worker');
   } catch (e) {
     worker = require('./SearchWorker.worker').default;
diff --git a/src/services/models/ApiInfo.ts b/src/services/models/ApiInfo.ts
index d67557f2..175cf5b0 100644
--- a/src/services/models/ApiInfo.ts
+++ b/src/services/models/ApiInfo.ts
@@ -1,5 +1,5 @@
 import { OpenAPIContact, OpenAPIInfo, OpenAPILicense } from '../../types';
-import { isBrowser } from '../../utils/';
+import { IS_BROWSER } from '../../utils/';
 import { OpenAPIParser } from '../OpenAPIParser';
 import { RedocNormalizedOptions } from '../RedocNormalizedOptions';
 
@@ -25,12 +25,12 @@ export class ApiInfoModel implements OpenAPIInfo {
       return this.parser.specUrl;
     }
 
-    if (isBrowser && window.Blob && window.URL) {
+    if (IS_BROWSER && window.Blob && window.URL) {
       const blob = new Blob([JSON.stringify(this.parser.spec, null, 2)], {
         type: 'application/json',
       });
       return window.URL.createObjectURL(blob);
-    } else if (!isBrowser) {
+    } else if (!IS_BROWSER) {
       return (
         'data:application/octet-stream;base64,' +
         new Buffer(JSON.stringify(this.parser.spec, null, 2)).toString('base64')
diff --git a/src/utils/dom.ts b/src/utils/dom.ts
index 4b069cd9..bce67e84 100644
--- a/src/utils/dom.ts
+++ b/src/utils/dom.ts
@@ -1,4 +1,4 @@
-export const isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';
+export const IS_BROWSER = typeof window !== 'undefined' && 'HTMLElement' in window;
 
 export function querySelector(selector: string): Element | null {
   if (typeof document !== 'undefined') {