diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 5d35b30086bf..b3bc75d03c50 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -55,7 +55,6 @@ rust_env_pairs
 rust_task_yield
 rust_task_is_unwinding
 rust_get_task
-rust_task_config_notify
 rust_task_weaken
 rust_task_unweaken
 sched_threads