diff --git a/include/boost/math/ccmath/isinf.hpp b/include/boost/math/ccmath/isinf.hpp
index 706b9605c2..338f7a7b0b 100644
--- a/include/boost/math/ccmath/isinf.hpp
+++ b/include/boost/math/ccmath/isinf.hpp
@@ -22,7 +22,7 @@
 namespace boost::math::ccmath {
 
 template <typename T>
-constexpr bool isinf(T x) noexcept
+constexpr bool (isinf)(T x) noexcept
 {
     if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
     {
@@ -41,11 +41,11 @@ constexpr bool isinf(T x) noexcept
         
         if constexpr (!std::is_integral_v<T>)
         {
-            return isinf(x);
+            return (isinf)(x);
         }
         else
         {
-            return isinf(static_cast<double>(x));
+            return (isinf)(static_cast<double>(x));
         }
     }
 }
diff --git a/include/boost/math/ccmath/isnan.hpp b/include/boost/math/ccmath/isnan.hpp
index ca915a4642..2394abfb7c 100644
--- a/include/boost/math/ccmath/isnan.hpp
+++ b/include/boost/math/ccmath/isnan.hpp
@@ -21,7 +21,7 @@
 namespace boost::math::ccmath {
 
 template <typename T>
-inline constexpr bool isnan(T x)
+inline constexpr bool (isnan)(T x)
 {
     if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
     {
@@ -33,11 +33,11 @@ inline constexpr bool isnan(T x)
 
         if constexpr (!std::is_integral_v<T>)
         {
-            return isnan(x);
+            return (isnan)(x);
         }
         else
         {
-            return isnan(static_cast<double>(x));
+            return (isnan)(static_cast<double>(x));
         }
     }
 }