diff --git a/rosella.c b/rosella.c
index 49c4688..707321b 100644
--- a/rosella.c
+++ b/rosella.c
@@ -38,7 +38,8 @@ int main(int argc, char **argv)
 
   test_builtins();
   test_weak_boxes_and_wills();
-  test_reader();
+  if (argc > 1)
+    test_reader();
   test_garbage_collection(argc > 1);
 
   return 0;