diff --git a/fm/io_interface.h b/fm/io_interface.h
index ca6c86ca..d17200cf 100644
--- a/fm/io_interface.h
+++ b/fm/io_interface.h
@@ -1,14 +1,10 @@
-#if defined(HAVE_WINDOWS_H) && !defined(_STRUCT_IOVEC)
-#if defined(HAS_IOV_BASE_IOVEC)
-#include <sys/uio.h>
-#else
+#if defined(_MSC_VER) && !defined(_STRUCT_IOVEC)
 #define _STRUCT_IOVEC
 struct	iovec {
     const void *iov_base;
     size_t	iov_len;
 };
 #endif
-#endif
 
 #ifndef _MSC_VER
 #define SOCKET int