diff --git a/stdlib/public/runtime/SwiftObject.mm b/stdlib/public/runtime/SwiftObject.mm
index 02ac2d9f73204..acee3dc8244ae 100644
--- a/stdlib/public/runtime/SwiftObject.mm
+++ b/stdlib/public/runtime/SwiftObject.mm
@@ -646,7 +646,7 @@ - (BOOL)isNSValue__      { return NO; }
 void swift::swift_nonatomic_unknownObjectRelease(void *object) {
   if (isObjCTaggedPointerOrNull(object)) return;
   if (objectUsesNativeSwiftReferenceCounting(object))
-    return swift_release(static_cast<HeapObject *>(object));
+    return swift_nonatomic_release(static_cast<HeapObject *>(object));
   return objc_release(static_cast<id>(object));
 }