diff --git a/src/lime/system/ThreadPool.hx b/src/lime/system/ThreadPool.hx
index d9a88aee89..8ae4db6157 100644
--- a/src/lime/system/ThreadPool.hx
+++ b/src/lime/system/ThreadPool.hx
@@ -12,6 +12,7 @@ import cpp.vm.Thread;
 import neko.vm.Thread;
 #elseif html5
 import lime._internal.backend.html5.HTML5Thread as Thread;
+import lime._internal.backend.html5.HTML5Thread.Transferable;
 #end
 
 /**