@@ -29,11 +29,11 @@
 # undef __USE_XOPEN
 #endif
 
 #include "platform.h"
 
-#ifndef OF_WINDOWS
+#ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
 
 #ifdef OF_HAVE_SCHED_YIELD
 # include <sched.h>