diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 3430f77c892..968c2dd1a61 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -62,6 +62,7 @@ vec_from_buf_shared
 task_sleep
 task_yield
 task_join
+get_type_desc
 unsupervise
 upcall_alloc_c_stack
 upcall_call_c_stack