diff --git a/src/ntstatus.h b/src/ntstatus.h
index d6eb493..941d37a 100644
--- a/src/ntstatus.h
+++ b/src/ntstatus.h
@@ -88,20 +88,4 @@ typedef NTSTATUS* PNTSTATUS;
 #define STATUS_SEVERITY_ERROR 0x3
 #endif
 
-#ifndef FACILITY_NTWIN32
-#define FACILITY_NTWIN32 0x7
-#endif
-
-/* This is not the NTSTATUS_FROM_WIN32 that the DDK provides, because the
- * DDK got it wrong!
- */
-#ifdef NTSTATUS_FROM_WIN32
-#undef NTSTATUS_FROM_WIN32
-#endif
-#define NTSTATUS_FROM_WIN32(error)                                      \
-  ((NTSTATUS)(error) <= 0                                               \
-       ? ((NTSTATUS)(error))                                            \
-       : ((NTSTATUS)(((error) &0x0000FFFF) | (FACILITY_NTWIN32 << 16) | \
-                     ERROR_SEVERITY_WARNING)))
-
 #endif /* EPOLL_NTSTATUS_H_ */