diff --git a/src/common/consprop.c b/src/common/consprop.c
index 9bf1d2a78..c45bb14a4 100644
--- a/src/common/consprop.c
+++ b/src/common/consprop.c
@@ -31,10 +31,12 @@
 
 
 #include <stdlib.h>
-#include <unistd.h>
-#ifdef _WIN32
-#include <windows.h>
-#define isatty _isatty
+#if !defined(WIN32)
+#  include <unistd.h>
+#else
+#  include <windows.h>
+#  include <io.h>
+#  define isatty _isatty
 #endif
 
 /* common */