diff --git a/dlls/compstui/compstui.spec b/dlls/compstui/compstui.spec
index 08fdb47ccf..7ba72a529b 100644
--- a/dlls/compstui/compstui.spec
+++ b/dlls/compstui/compstui.spec
@@ -1,4 +1,4 @@
 @ stdcall CommonPropertySheetUIA(long ptr long ptr)
 @ stdcall CommonPropertySheetUIW(long ptr long ptr)
 @ stdcall GetCPSUIUserData(long)
-@ stdcall SetCPSUIUserData(long ptr)
+@ stdcall SetCPSUIUserData(long long)