diff --git a/include/uv/win.h b/include/uv/win.h
index a88bf29e9..e0de5a6db 100644
--- a/include/uv/win.h
+++ b/include/uv/win.h
@@ -684,6 +684,7 @@ typedef struct {
 #define UV_FS_O_TEMPORARY    _O_TEMPORARY
 #define UV_FS_O_TRUNC        _O_TRUNC
 #define UV_FS_O_WRONLY       _O_WRONLY
+#define UV_FS_O_SHARE_RDONLY 0x40000000 /* READ ONLY SHARING MODE */
 
 /* fs open() flags supported on other platforms (or mapped on this platform): */
 #define UV_FS_O_DIRECT       0x02000000 /* FILE_FLAG_NO_BUFFERING */
diff --git a/src/win/fs.c b/src/win/fs.c
index cc2e8db94..3fabadaea 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -482,6 +482,8 @@ void fs__open(uv_fs_t* req) {
    */
   if (flags & UV_FS_O_EXLOCK) {
     share = 0;
+  }  else if (flags & UV_FS_O_SHARE_RDONLY) {
+    share = FILE_SHARE_READ;
   } else {
     share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
   }