diff --git a/std/os/windows/bits.zig b/std/os/windows/bits.zig
index d05266c9fc1b01e0081966a570471edb548aed0b..b463ef4c61fecdb8ca16984ba2022edac9232967 100644
--- a/std/os/windows/bits.zig
+++ b/std/os/windows/bits.zig
@@ -538,5 +538,3 @@ pub const FORMAT_MESSAGE_FROM_STRING = 0x00000400;
 pub const FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000;
 pub const FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;
 pub const FORMAT_MESSAGE_MAX_WIDTH_MASK = 0x000000FF;
-pub const FORMAT_MESSAGE_FROM_HMODULE = 0x00000800;
-pub const FORMAT_MESSAGE_FROM_STRING = 0x00000400;