diff --git a/assets/directory_asset_bundle.cc b/assets/directory_asset_bundle.cc
index 065e3d976e92e5c33f61f0530aacc4f8961006b3..afb419c300f2099c0ca587cefa40258cf3d24bd2 100644
--- a/assets/directory_asset_bundle.cc
+++ b/assets/directory_asset_bundle.cc
@@ -7,13 +7,16 @@
 
 #include <fcntl.h>
 
+#if !defined(OS_WIN)
+#include <unistd.h>
+#endif
+
 #include <utility>
 
 #include "lib/fxl/files/eintr_wrapper.h"
 #include "lib/fxl/files/file.h"
 #include "lib/fxl/files/path.h"
 #include "lib/fxl/files/unique_fd.h"
-#include "lib/fxl/portable_unistd.h"
 
 namespace blink {