diff --git a/include/boost/math/quadrature/trapezoidal.hpp b/include/boost/math/quadrature/trapezoidal.hpp
index 4faf4b8bf..22f2a0888 100644
--- a/include/boost/math/quadrature/trapezoidal.hpp
+++ b/include/boost/math/quadrature/trapezoidal.hpp
@@ -18,7 +18,6 @@
 #include <cmath>
 #include <limits>
 #include <stdexcept>
-#include <type_traits> // for std::result_of, std::invoke_result
 #include <boost/math/constants/constants.hpp>
 #include <boost/math/special_functions/fpclassify.hpp>
 #include <boost/math/policies/error_handling.hpp>