diff --git a/client/win/win_idle_tracker.def b/client/win/win_idle_tracker.def
new file mode 100644
index 0000000000..f24545c489
--- /dev/null
+++ b/client/win/win_idle_tracker.def
@@ -0,0 +1,10 @@
+; test.def : Declares the module parameters for the DLL.
+
+LIBRARY      "boinc"
+DESCRIPTION  'boinc Windows Dynamic Link Library'
+
+EXPORTS
+    ; Explicit exports can go here
+	IdleTrackerInit
+	IdleTrackerTerm
+	IdleTrackerGetLastTickCount