diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 8a44a7ab151c..da353e9f6a67 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -67,6 +67,7 @@ upcall_intern_dict
 upcall_log_type
 upcall_malloc
 upcall_rust_personality
+upcall_s_shared_malloc
 upcall_shared_malloc
 upcall_shared_free
 upcall_vec_grow