diff --git a/runtime/libcn/include/cn-testing/test.h b/runtime/libcn/include/cn-testing/test.h
index 2aca0f1d9..627b0a9c2 100644
--- a/runtime/libcn/include/cn-testing/test.h
+++ b/runtime/libcn/include/cn-testing/test.h
@@ -111,7 +111,7 @@ size_t cn_gen_compute_size(enum cn_gen_sizing_strategy strategy,
       if (!replay) {                                                                     \
         cn_gen_set_input_timer(cn_gen_get_milliseconds());                               \
       } else {                                                                           \
-        cn_gen_set_input_timer(0);                                                       \
+        cn_gen_set_input_timeout(0);                                                     \
       }                                                                                  \
       struct cn_gen_##Name##_record* res = cn_gen_##Name();                              \
       if (cn_gen_backtrack_type() != CN_GEN_BACKTRACK_NONE) {                            \
diff --git a/runtime/libcn/src/cn-testing/test.c b/runtime/libcn/src/cn-testing/test.c
index 79786235a..66c3593f6 100644
--- a/runtime/libcn/src/cn-testing/test.c
+++ b/runtime/libcn/src/cn-testing/test.c
@@ -344,7 +344,12 @@ int cn_test_main(int argc, char* argv[]) {
           cn_printf(CN_LOGGING_ERROR, "\n");
 
           cn_test_reproduce(&repros[i]);
-          test_case->func(true, CN_TEST_GEN_PROGRESS_NONE, sizing_strategy, trap);
+          enum cn_test_result replay_result =
+              test_case->func(true, CN_TEST_GEN_PROGRESS_NONE, sizing_strategy, trap);
+          if (replay_result != CN_TEST_FAIL) {
+            fprintf(stderr, "Replay of failure did not fail.\n");
+            abort();
+          }
 
           set_cn_logging_level(CN_LOGGING_NONE);