diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 3550fb823e80..32f9ceab93f1 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -2152,7 +2152,6 @@ pub const LONG = i32;
 pub const ULONG64 = u64;
 pub const ULONGLONG = u64;
 pub const LONGLONG = i64;
-pub const ULONG64 = u64;
 pub const HLOCAL = HANDLE;
 pub const LANGID = c_ushort;