diff --git a/src/win/fs.c b/src/win/fs.c
index 5edfee88..dee34cd3 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -221,6 +221,7 @@ INLINE static int fs__capture_path(uv_fs_t* req, const char* path,
 
 INLINE static void uv_fs_req_init(uv_loop_t* loop, uv_fs_t* req,
     uv_fs_type fs_type, const uv_fs_cb cb) {
+  uv__once_init();
   UV_REQ_INIT(req, UV_FS);
   req->loop = loop;
   req->flags = 0;
diff --git a/src/win/pipe.c b/src/win/pipe.c
index 9b10cc9f..5c666788 100644
--- a/src/win/pipe.c
+++ b/src/win/pipe.c
@@ -1913,6 +1913,7 @@ int uv_pipe_open(uv_pipe_t* pipe, uv_file file) {
   if (os_handle == INVALID_HANDLE_VALUE)
     return UV_EBADF;
 
+  uv__once_init();
   /* In order to avoid closing a stdio file descriptor 0-2, duplicate the
    * underlying OS handle and forget about the original fd.
    * We could also opt to use the original OS handle and just never close it,
@@ -1986,6 +1987,7 @@ static int uv__pipe_getname(const uv_pipe_t* handle, char* buffer, size_t* size)
   unsigned int name_len;
   int err;
 
+  uv__once_init();
   name_info = NULL;
 
   if (handle->handle == INVALID_HANDLE_VALUE) {
diff --git a/src/win/tty.c b/src/win/tty.c
index a6f58395..c4f99bdc 100644
--- a/src/win/tty.c
+++ b/src/win/tty.c
@@ -148,6 +148,7 @@ int uv_tty_init(uv_loop_t* loop, uv_tty_t* tty, uv_file fd, int readable) {
   HANDLE handle;
   CONSOLE_SCREEN_BUFFER_INFO screen_buffer_info;
 
+  uv__once_init();
   handle = (HANDLE) uv__get_osfhandle(fd);
   if (handle == INVALID_HANDLE_VALUE)
     return UV_EBADF;