diff --git a/dlls/ntdll/om.c b/dlls/ntdll/om.c
index c3a17f77483..aaed9abaa93 100644
--- a/dlls/ntdll/om.c
+++ b/dlls/ntdll/om.c
@@ -351,28 +351,8 @@ NTSTATUS WINAPI NtDuplicateObject( HANDLE source_process, HANDLE source,
                                    HANDLE dest_process, PHANDLE dest,
                                    ACCESS_MASK access, ULONG attributes, ULONG options )
 {
-    NTSTATUS ret;
-    SERVER_START_REQ( dup_handle )
-    {
-        req->src_process = wine_server_obj_handle( source_process );
-        req->src_handle  = wine_server_obj_handle( source );
-        req->dst_process = wine_server_obj_handle( dest_process );
-        req->access      = access;
-        req->attributes  = attributes;
-        req->options     = options;
-
-        if (!(ret = wine_server_call( req )))
-        {
-            if (dest) *dest = wine_server_ptr_handle( reply->handle );
-            if (reply->closed && reply->self)
-            {
-                int fd = unix_funcs->server_remove_fd_from_cache( source );
-                if (fd != -1) close( fd );
-            }
-        }
-    }
-    SERVER_END_REQ;
-    return ret;
+    return unix_funcs->NtDuplicateObject( source_process, source, dest_process,
+                                          dest, access, attributes, options );
 }
 
 static LONG WINAPI invalid_handle_exception_handler( EXCEPTION_POINTERS *eptr )
@@ -384,16 +364,7 @@ static LONG WINAPI invalid_handle_exception_handler( EXCEPTION_POINTERS *eptr )
 /* Everquest 2 / Pirates of the Burning Sea hooks NtClose, so we need a wrapper */
 NTSTATUS close_handle( HANDLE handle )
 {
-    NTSTATUS ret;
-    int fd = unix_funcs->server_remove_fd_from_cache( handle );
-
-    SERVER_START_REQ( close_handle )
-    {
-        req->handle = wine_server_obj_handle( handle );
-        ret = wine_server_call( req );
-    }
-    SERVER_END_REQ;
-    if (fd != -1) close( fd );
+    NTSTATUS ret = unix_funcs->NtClose( handle );
 
     if (ret == STATUS_INVALID_HANDLE && handle && NtCurrentTeb()->Peb->BeingDebugged)
     {
diff --git a/dlls/ntdll/unix/loader.c b/dlls/ntdll/unix/loader.c
index 4a3f101d301..dfe6b6b1ad9 100644
--- a/dlls/ntdll/unix/loader.c
+++ b/dlls/ntdll/unix/loader.c
@@ -983,6 +983,8 @@ static HMODULE load_ntdll(void)
  */
 static struct unix_funcs unix_funcs =
 {
+    NtClose,
+    NtDuplicateObject,
     get_main_args,
     get_paths,
     get_dll_path,
@@ -999,7 +1001,6 @@ static struct unix_funcs unix_funcs =
     server_call_unlocked,
     wine_server_call,
     server_send_fd,
-    server_remove_fd_from_cache,
     server_get_unix_fd,
     server_fd_to_handle,
     server_handle_to_fd,
diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c
index 8dc3f33bc80..d301da534ec 100644
--- a/dlls/ntdll/unix/server.c
+++ b/dlls/ntdll/unix/server.c
@@ -542,9 +542,9 @@ static inline NTSTATUS get_cached_fd( HANDLE handle, int *fd, enum server_fd_typ
 
 
 /***********************************************************************
- *           server_remove_fd_from_cache
+ *           remove_fd_from_cache
  */
-int CDECL server_remove_fd_from_cache( HANDLE handle )
+static int remove_fd_from_cache( HANDLE handle )
 {
     unsigned int entry, idx = handle_to_index( handle, &entry );
     int fd = -1;
@@ -1122,3 +1122,53 @@ size_t CDECL server_init_thread( void *entry_point, BOOL *suspend, unsigned int
         server_protocol_error( "init_thread failed with status %x\n", ret );
     }
 }
+
+
+/******************************************************************************
+ *           NtDuplicateObject
+ */
+NTSTATUS WINAPI NtDuplicateObject( HANDLE source_process, HANDLE source, HANDLE dest_process, HANDLE *dest,
+                                   ACCESS_MASK access, ULONG attributes, ULONG options )
+{
+    NTSTATUS ret;
+
+    SERVER_START_REQ( dup_handle )
+    {
+        req->src_process = wine_server_obj_handle( source_process );
+        req->src_handle  = wine_server_obj_handle( source );
+        req->dst_process = wine_server_obj_handle( dest_process );
+        req->access      = access;
+        req->attributes  = attributes;
+        req->options     = options;
+        if (!(ret = wine_server_call( req )))
+        {
+            if (dest) *dest = wine_server_ptr_handle( reply->handle );
+            if (reply->closed && reply->self)
+            {
+                int fd = remove_fd_from_cache( source );
+                if (fd != -1) close( fd );
+            }
+        }
+    }
+    SERVER_END_REQ;
+    return ret;
+}
+
+
+/**************************************************************************
+ *           NtClose
+ */
+NTSTATUS WINAPI NtClose( HANDLE handle )
+{
+    NTSTATUS ret;
+    int fd = remove_fd_from_cache( handle );
+
+    SERVER_START_REQ( close_handle )
+    {
+        req->handle = wine_server_obj_handle( handle );
+        ret = wine_server_call( req );
+    }
+    SERVER_END_REQ;
+    if (fd != -1) close( fd );
+    return ret;
+}
diff --git a/dlls/ntdll/unix/unix_private.h b/dlls/ntdll/unix/unix_private.h
index 2bf39f85371..30b130aa373 100644
--- a/dlls/ntdll/unix/unix_private.h
+++ b/dlls/ntdll/unix/unix_private.h
@@ -62,7 +62,6 @@ extern void CDECL dbg_init(void) DECLSPEC_HIDDEN;
 
 extern unsigned int CDECL server_call_unlocked( void *req_ptr ) DECLSPEC_HIDDEN;
 extern void CDECL server_send_fd( int fd ) DECLSPEC_HIDDEN;
-extern int CDECL server_remove_fd_from_cache( HANDLE handle ) DECLSPEC_HIDDEN;
 extern int CDECL server_get_unix_fd( HANDLE handle, unsigned int wanted_access, int *unix_fd,
                                      int *needs_close, enum server_fd_type *type,
                                      unsigned int *options ) DECLSPEC_HIDDEN;
diff --git a/dlls/ntdll/unixlib.h b/dlls/ntdll/unixlib.h
index 142e8956e7e..4af2dbe31fa 100644
--- a/dlls/ntdll/unixlib.h
+++ b/dlls/ntdll/unixlib.h
@@ -25,10 +25,16 @@
 #include "wine/debug.h"
 
 /* increment this when you change the function table */
-#define NTDLL_UNIXLIB_VERSION 10
+#define NTDLL_UNIXLIB_VERSION 11
 
 struct unix_funcs
 {
+    /* Nt* functions */
+    NTSTATUS      (WINAPI *NtClose)( HANDLE handle );
+    NTSTATUS      (WINAPI *NtDuplicateObject)( HANDLE source_process, HANDLE source,
+                                               HANDLE dest_process, HANDLE *dest,
+                                               ACCESS_MASK access, ULONG attributes, ULONG options );
+
     /* environment functions */
     void          (CDECL *get_main_args)( int *argc, char **argv[], char **envp[] );
     void          (CDECL *get_paths)( const char **builddir, const char **datadir, const char **configdir );
@@ -54,7 +60,6 @@ struct unix_funcs
     unsigned int  (CDECL *server_call_unlocked)( void *req_ptr );
     unsigned int  (CDECL *server_call)( void *req_ptr );
     void          (CDECL *server_send_fd)( int fd );
-    int           (CDECL *server_remove_fd_from_cache)( HANDLE handle );
     int           (CDECL *server_get_unix_fd)( HANDLE handle, unsigned int wanted_access, int *unix_fd,
                                                int *needs_close, enum server_fd_type *type, unsigned int *options );
     NTSTATUS      (CDECL *server_fd_to_handle)( int fd, unsigned int access, unsigned int attributes,