diff --git a/src/WindowsPlatform.hh b/src/WindowsPlatform.hh
new file mode 100644
index 00000000..403d03be
--- /dev/null
+++ b/src/WindowsPlatform.hh
@@ -0,0 +1,15 @@
+#pragma once
+
+// <windows.h> defines a lot of annoying things like ERROR and DELETE, which
+// we use as names in enum classes, so we wrap <windows.h> with this header
+// that undoes some of these annoying things.
+
+#include <phosg/Platform.hh>
+
+#ifdef PHOSG_WINDOWS
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef DELETE
+#undef ERROR
+#undef PASSTHROUGH
+#endif