diff --git a/src/core/index.js b/src/core/index.js
index 330ad8a7..b6ab52dc 100644
--- a/src/core/index.js
+++ b/src/core/index.js
@@ -8,3 +8,4 @@ export * from "./PsychoJS.js";
 export * from "./ServerManager.js";
 export * from "./Window.js";
 export * from "./WindowMixin.js";
+export * from "../util/Clock.js";