diff --git a/cpucount.c b/cpucount.c
index 02cf3f9..b5fd7ef 100644
--- a/cpucount.c
+++ b/cpucount.c
@@ -41,10 +41,16 @@
 #  include <sys/sysctl.h>
 #endif
 
-#include <unistd.h>
 #include <string.h>
 #include <stdio.h>
 
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#define UNICODE 1
+#include <windows.h>
+#endif
+
 #ifdef __linux__
 #include <stdio.h>
 #include <stdlib.h>