diff --git a/src/eval.c b/src/eval.c
index 5fde49a..6241ba4 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1296,7 +1296,7 @@ apfl_iterative_runner_next(apfl_iterative_runner runner)
     apfl_push_userdata(runner->ctx, runner);
     apfl_cfunc_setslot(runner->ctx, -2, 0, -1);
     apfl_list_create(runner->ctx, 0);
-    apfl_call_protected(runner->ctx, -2, -1, &runner->with_error_on_stack);
+    runner->result = apfl_call_protected(runner->ctx, -2, -1, &runner->with_error_on_stack);
 
     return !runner->end;
 }