diff --git a/src/lib/io.rs b/src/lib/io.rs
index 1f5f29f80fa..57ea12d3850 100644
--- a/src/lib/io.rs
+++ b/src/lib/io.rs
@@ -1,7 +1,7 @@
 
 import os::libc;
 
-native "rust" mod rustrt {
+native "c-stack-cdecl" mod rustrt {
     fn rust_get_stdin() -> os::libc::FILE;
     fn rust_get_stdout() -> os::libc::FILE;
     fn rust_get_stderr() -> os::libc::FILE;