diff --git a/lib/windows/winlean.nim b/lib/windows/winlean.nim
index e6a119e15f..89d86c62ac 100644
--- a/lib/windows/winlean.nim
+++ b/lib/windows/winlean.nim
@@ -18,7 +18,7 @@ const
 type
   Handle* = int
   LONG* = int32
-  ULONG* = int
+  ULONG* = int32
   PULONG* = ptr int
   WINBOOL* = int32
   DWORD* = int32