diff --git a/gzguts.h b/gzguts.h
index 3107c36..f8dd9ad 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -27,7 +27,7 @@
 #endif
 #include <fcntl.h>
 
-#ifdef __TURBOC__
+#if defined(__TURBOC__) || defined(_MSC_VER)
 #  include <io.h>
 #endif
 
@@ -66,7 +66,6 @@
 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
 #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
 #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
-#         include <io.h>
 #         define vsnprintf _vsnprintf
 #      endif
 #    endif