diff --git a/Framework/Units/PhysicalUnits.h b/Framework/Units/PhysicalUnits.h
index 450dd9d02b75642de13d4124739570daaa0d7749..aa34bc8bdaf9f67a6c3629d88688cc24157d3f20 100644
--- a/Framework/Units/PhysicalUnits.h
+++ b/Framework/Units/PhysicalUnits.h
@@ -102,12 +102,6 @@ namespace phys {
 
       QUANTITY_DEFINE_SCALING_LITERALS(gram, mass_d, 1e-3)
 
-      /*
-    QUANTITY_DEFINE_LITERALS(meter, length_d)
-    QUANTITY_DEFINE_LITERALS(second, time_interval_d)
-    QUANTITY_DEFINE_LITERALS(ampere, electric_current_d)
-    QUANTITY_DEFINE_LITERALS(Kelvin, thermodynamic_temperature_d)
-      */
 
     } // namespace literals
   }   // namespace units