diff --git a/kernel/gzip.cc b/kernel/gzip.cc
index 0da53ff68..71a498bb0 100644
--- a/kernel/gzip.cc
+++ b/kernel/gzip.cc
@@ -2,11 +2,17 @@
 #include "kernel/log.h"
 #include "kernel/gzip.h"
 #include <iostream>
-#include <dirent.h>
 #include <string>
 #include <cstdarg>
 #include <cstdio>
 
+#if !defined(WIN32)
+#include <dirent.h>
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
 YOSYS_NAMESPACE_BEGIN
 
 
diff --git a/kernel/gzip.h b/kernel/gzip.h
index 0201d2340..57eac73c8 100644
--- a/kernel/gzip.h
+++ b/kernel/gzip.h
@@ -1,5 +1,4 @@
 #include <string>
-#include <unistd.h>
 #include "kernel/yosys_common.h"
 
 #ifndef YOSYS_GZIP_H
diff --git a/kernel/io.cc b/kernel/io.cc
index 0fdbd3c37..7bb29499d 100644
--- a/kernel/io.cc
+++ b/kernel/io.cc
@@ -1,9 +1,15 @@
 #include "kernel/yosys_common.h"
 #include "kernel/log.h"
 #include <iostream>
-#include <dirent.h>
 #include <string>
 
+#if !defined(WIN32)
+#include <dirent.h>
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
 YOSYS_NAMESPACE_BEGIN
 
 // Set of utilities for handling files