diff --git a/concepts.hpp b/concepts.hpp
index 243a49ad..f4789a4f 100644
--- a/concepts.hpp
+++ b/concepts.hpp
@@ -206,7 +206,7 @@ namespace cruft::concepts {
         typename std::iterator_traits<T>::pointer;
         typename std::iterator_traits<T>::iterator_category;
 
-        { *t };
+        {  *t };
         { ++t } -> same_as<T&>;
     };