diff --git a/dlls/ntdll/server.c b/dlls/ntdll/server.c
index ac3183b3c5192ae9246fa38c666b960929db2c5f..ed77aa5173b09b76a379182f68163fe06ccd9ec8 100644
--- a/dlls/ntdll/server.c
+++ b/dlls/ntdll/server.c
@@ -406,10 +406,9 @@ static BOOL invoke_apc( const apc_call_t *call, apc_result_t *result )
     {
         void *apc = NULL, *arg = NULL;
         IO_STATUS_BLOCK *iosb = wine_server_get_ptr( call->async_io.sb );
-        NTSTATUS (*func)(void *, IO_STATUS_BLOCK *, NTSTATUS, void **, void **) = wine_server_get_ptr( call->async_io.func );
+        NTSTATUS (**user)(void *, IO_STATUS_BLOCK *, NTSTATUS, void **, void **) = wine_server_get_ptr( call->async_io.user );
         result->type = call->type;
-        result->async_io.status = func( wine_server_get_ptr( call->async_io.user ),
-                                        iosb, call->async_io.status, &apc, &arg );
+        result->async_io.status = (*user)( user, iosb, call->async_io.status, &apc, &arg );
         if (result->async_io.status != STATUS_PENDING)
         {
             result->async_io.total = iosb->Information;