diff --git a/include/internal/catch_approx.hpp b/include/internal/catch_approx.hpp
index 80a17ebbfb..687e88f0d7 100644
--- a/include/internal/catch_approx.hpp
+++ b/include/internal/catch_approx.hpp
@@ -45,14 +45,14 @@ namespace Detail {
             return approx;
         }
 #if defined(__cplusplus) && __cplusplus >= 201103L
-        template <typename T, typename = typename std::enable_if<std::is_constructible<T, double>::value>::type>
+        template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
         friend bool operator == ( const T& lhs, Approx const& rhs ) {
             // Thanks to Richard Harris for his help refining this formula
-            auto lhs_v = (double)lhs;
+            auto lhs_v = double(lhs);
             return fabs( lhs_v - rhs.m_value ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs_v), fabs(rhs.m_value) ) );
         }
 
-        template <typename T, typename = typename std::enable_if<std::is_constructible<T, double>::value>::type>
+        template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
         friend bool operator == ( Approx const& lhs, const T& rhs ) {
             return operator==( rhs, lhs );
         }