diff --git a/include/tao/pq/internal/format_as.hpp b/include/tao/pq/internal/format_as.hpp
index 892c49c..184e39a 100644
--- a/include/tao/pq/internal/format_as.hpp
+++ b/include/tao/pq/internal/format_as.hpp
@@ -6,6 +6,7 @@
 #define TAO_PQ_INTERNAL_FORMAT_AS_HPP
 
 #include <format>
+#include <ostream>
 #include <utility>
 
 template< typename T >
@@ -18,4 +19,11 @@ struct std::formatter< T > : std::formatter< decltype( taopq_format_as( std::dec
    }
 };
 
+template< typename T >
+   requires requires { taopq_format_as( std::declval< T >() ); }
+std::ostream& operator<<( std::ostream& os, const T& v )
+{
+   return os << taopq_format_as( v );
+}
+
 #endif