diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 2e687472a8d6..b49aa89b6c8d 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -14,7 +14,6 @@ rust_gmtime
 rust_localtime
 rust_timegm
 rust_mktime
-last_os_error
 new_task
 precise_time_ns
 rand_free