diff --git a/include/boost/math/special_functions/detail/erf_inv.hpp b/include/boost/math/special_functions/detail/erf_inv.hpp
index f5d8ee471..6ac1bcd93 100644
--- a/include/boost/math/special_functions/detail/erf_inv.hpp
+++ b/include/boost/math/special_functions/detail/erf_inv.hpp
@@ -282,7 +282,7 @@ struct erf_roots
       BOOST_MATH_STD_USING
       T derivative = sign * (2 / sqrt(constants::pi<T>())) * exp(-(guess * guess));
       T derivative2 = -2 * guess * derivative;
-      return boost::math::make_tuple(((sign > 0) ? boost::math::erf(guess, Policy()) : boost::math::erfc(guess, Policy())) - target, derivative, derivative2);
+      return boost::math::make_tuple(((sign > 0) ? boost::math::erf(guess, Policy()) : static_cast<T>(boost::math::erfc(guess, Policy())) - target), derivative, derivative2);
    }
    erf_roots(T z, int s) : target(z), sign(s) {}
 private:
diff --git a/include/boost/math/special_functions/detail/ibeta_inverse.hpp b/include/boost/math/special_functions/detail/ibeta_inverse.hpp
index ccfa9197d..036998235 100644
--- a/include/boost/math/special_functions/detail/ibeta_inverse.hpp
+++ b/include/boost/math/special_functions/detail/ibeta_inverse.hpp
@@ -35,12 +35,12 @@ struct temme_root_finder
       if(y == 0)
       {
          T big = tools::max_value<T>() / 4;
-         return boost::math::make_tuple(-big, -big);
+         return boost::math::make_tuple(static_cast<T>(-big), static_cast<T>(-big));
       }
       if(x == 0)
       {
          T big = tools::max_value<T>() / 4;
-         return boost::math::make_tuple(-big, big);
+         return boost::math::make_tuple(static_cast<T>(-big), big);
       }
       T f = log(x) + a * log(y) + t;
       T f1 = (1 / x) - (a / (y));
diff --git a/include/boost/math/special_functions/detail/igamma_inverse.hpp b/include/boost/math/special_functions/detail/igamma_inverse.hpp
index 53875ff83..5d8636dcd 100644
--- a/include/boost/math/special_functions/detail/igamma_inverse.hpp
+++ b/include/boost/math/special_functions/detail/igamma_inverse.hpp
@@ -378,7 +378,7 @@ struct gamma_p_inverse_func
          f2 = -f2;
       }
 
-      return boost::math::make_tuple(f - p, f1, f2);
+      return boost::math::make_tuple(static_cast<T>(f - p), f1, f2);
    }
 private:
    T a, p;