diff --git a/pyml_arch.ml.c b/pyml_arch.ml.c
index 4d9da0e..a6caf24 100644
--- a/pyml_arch.ml.c
+++ b/pyml_arch.ml.c
@@ -14,7 +14,7 @@ type t = Windows | Mac | Unix
 let os = PLATFORM_NAME
 
 #ifdef WIN_HANDLE_FD
-  external fd_of_int : int -> Unix.file_descr = "win_handle_fd"
+  external fd_of_int : int -> Unix.file_descr = "caml_unix_filedescr_of_fd"
 #else
   external fd_of_int : int -> Unix.file_descr = "%identity"
 #endif
diff --git a/pyml_stubs.c b/pyml_stubs.c
index 40e3481..8e357e6 100644
--- a/pyml_stubs.c
+++ b/pyml_stubs.c
@@ -6,6 +6,7 @@
 #include <caml/custom.h>
 #include <caml/alloc.h>
 #include <caml/intext.h>
+#include <caml/unixsupport.h>
 #include <string.h>
 #include <stdbool.h>
 #include <stdio.h>