diff --git a/include/xo/unit/Quantity.hpp b/include/xo/unit/Quantity.hpp
index 299e0d2..0a4fc8b 100644
--- a/include/xo/unit/Quantity.hpp
+++ b/include/xo/unit/Quantity.hpp
@@ -40,8 +40,9 @@ namespace xo {
             constexpr const repr_type & scale() const { return scale_; }
             constexpr const unit_type & unit() const { return unit_; }
 
-            constexpr Quantity unit_qty() const { return Quantity(1, unit_); }
+            constexpr bool is_dimensionless() const { return unit_.is_dimensionless(); }
 
+            constexpr Quantity unit_qty() const { return Quantity(1, unit_); }
             constexpr Quantity reciprocal() const { return Quantity(1.0 / scale_, unit_.reciprocal()); }
 
             template <typename Quantity2>
diff --git a/utest/unit.test.cpp b/utest/unit.test.cpp
index 061d45a..59386d9 100644
--- a/utest/unit.test.cpp
+++ b/utest/unit.test.cpp
@@ -46,8 +46,6 @@ namespace xo {
         using xo::qty::detail::nu_ratio;
         using xo::qty::unit_qty;
 
-        using xo::print::ccs;
-
         template <typename T>
         int unused()
         {