diff --git a/src/catch2/benchmark/catch_environment.hpp b/src/catch2/benchmark/catch_environment.hpp
index de4d77df..5d3816a5 100644
--- a/src/catch2/benchmark/catch_environment.hpp
+++ b/src/catch2/benchmark/catch_environment.hpp
@@ -27,7 +27,6 @@ namespace Catch {
         };
         template <typename Clock>
         struct Environment {
-            using clock_type = Clock;
             EnvironmentEstimate<FloatDuration<Clock>> clock_resolution;
             EnvironmentEstimate<FloatDuration<Clock>> clock_cost;
         };