diff --git a/artiq/runtime/ksupport.c b/artiq/runtime/ksupport.c
index 13c89f690..5f985e65d 100644
--- a/artiq/runtime/ksupport.c
+++ b/artiq/runtime/ksupport.c
@@ -423,6 +423,8 @@ void __artiq_terminate(struct artiq_exception *artiq_exn,
 {
     struct msg_exception msg;
 
+    now_save();
+
     msg.type = MESSAGE_TYPE_EXCEPTION;
     msg.exception = artiq_exn;
     msg.backtrace = backtrace;