diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 620e9199e0172..2079db6146610 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -86,6 +86,11 @@ upcall_del_stack
 upcall_reset_stack_limit
 upcall_exchange_malloc
 upcall_exchange_free
+rust_upcall_exchange_free
+rust_upcall_exchange_malloc
+rust_upcall_fail
+rust_upcall_free
+rust_upcall_malloc
 rust_uv_loop_new
 rust_uv_loop_delete
 rust_uv_loop_refcount