diff --git a/include/xo/indentlog/print/ppdetail_atomic.hpp b/include/xo/indentlog/print/ppdetail_atomic.hpp
index aa1f469..dfeaf41 100644
--- a/include/xo/indentlog/print/ppdetail_atomic.hpp
+++ b/include/xo/indentlog/print/ppdetail_atomic.hpp
@@ -16,7 +16,7 @@ namespace xo {
         // Defining this means ppdetail_atomic is not used.
         // In that case where not explicitly specialized ppdetail will revert to ordinary printing for a type,
         // instead of giving compile-time error about missing template specialization of ppdetail.
-//#define ppdetail_atomic ppdetail
+#define ppdetail_atomic ppdetail
 
         struct ppindentinfo {
             ppindentinfo(ppstate * pps, std::uint32_t ci0, std::uint32_t indent_width, bool upto)
@@ -127,7 +127,7 @@ namespace xo {
 
         using voidptr = void*;
         PPDETAIL_ATOMIC(voidptr);
-#endif
+#endif // #ifndef ppdetail_atomic
 
     } /*namespace print*/
 } /*namespace xo*/