diff --git a/classnames/index.d.ts b/classnames/index.d.ts
index 7536aac170..22d9803399 100644
--- a/classnames/index.d.ts
+++ b/classnames/index.d.ts
@@ -3,7 +3,7 @@
 // Definitions by: Dave Keen <http://www.keendevelopment.ch>, Adi Dahiya <https://github.com/adidahiya>, Jason Killian <https://github.com/JKillian>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare type ClassValue = string | number | ClassDictionary | ClassArray | undefined | null;
+declare type ClassValue = string | number | ClassDictionary | ClassArray | undefined | null | false;
 
 interface ClassDictionary {
 	[id: string]: boolean | undefined | null;