diff --git a/src/index.tsx b/src/index.tsx
index 6765ff5..2bc4f91 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,5 +1,3 @@
-/* global global */
-
 import * as React from 'react';
 
 type Props = React.HTMLAttributes<HTMLDivElement> & {
@@ -65,9 +63,14 @@ const KEYCODE_ESCAPE = 27;
 const HISTORY_LIMIT = 100;
 const HISTORY_TIME_GAP = 3000;
 
-const isWindows = 'navigator' in global && /Win/i.test(navigator.platform);
+const isWindows =
+  typeof window !== 'undefined' &&
+  'navigator' in window &&
+  /Win/i.test(navigator.platform);
 const isMacLike =
-  'navigator' in global && /(Mac|iPhone|iPod|iPad)/i.test(navigator.platform);
+  typeof window !== 'undefined' &&
+  'navigator' in window &&
+  /(Mac|iPhone|iPod|iPad)/i.test(navigator.platform);
 
 const className = 'npm__react-simple-code-editor__textarea';