diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index cf10a402c48e..9ea6bee4262f 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -46,7 +46,9 @@ upcall_kill
 upcall_log_double
 upcall_log_float
 upcall_log_int
+upcall_log_int_rustboot
 upcall_log_str
+upcall_log_str_rustboot
 upcall_malloc
 upcall_mark
 upcall_new_chan