diff --git a/src/getopt.c b/src/getopt.c
index 8651b87..6a486ec 100644
--- a/src/getopt.c
+++ b/src/getopt.c
@@ -33,7 +33,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
+#ifndef _WIN32
+# include <unistd.h>
+#endif
 
 int	opterr = 1,		/* if error message should be printed */
 	optind = 1,		/* index into parent argv vector */