diff --git a/src/unix/internal.h b/src/unix/internal.h
index e4ff91b8..fd29b88d 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -241,8 +241,8 @@ void uv__udp_finish_close(uv_udp_t* handle);
 uv_handle_type uv__handle_type(int fd);
 
 #if defined(__APPLE__)
-int uv___stream_fd(uv_stream_t* handle);
-#define uv__stream_fd(handle) (uv___stream_fd((uv_stream_t*) (handle)))
+int uv___stream_fd(const uv_stream_t* handle);
+#define uv__stream_fd(handle) (uv___stream_fd((const uv_stream_t*) (handle)))
 #else
 #define uv__stream_fd(handle) ((handle)->io_watcher.fd)
 #endif /* defined(__APPLE__) */
diff --git a/src/unix/stream.c b/src/unix/stream.c
index e1f66030..ac943ec6 100644
--- a/src/unix/stream.c
+++ b/src/unix/stream.c
@@ -1482,8 +1482,8 @@ int uv_is_writable(const uv_stream_t* stream) {
 
 
 #if defined(__APPLE__)
-int uv___stream_fd(uv_stream_t* handle) {
-  uv__stream_select_t* s;
+int uv___stream_fd(const uv_stream_t* handle) {
+  const uv__stream_select_t* s;
 
   assert(handle->type == UV_TCP ||
          handle->type == UV_TTY ||