diff --git a/libcxx/include/__cxx03/__math/traits.h b/libcxx/include/__cxx03/__math/traits.h
index 0d27680d579a4..6e832342cf764 100644
--- a/libcxx/include/__cxx03/__math/traits.h
+++ b/libcxx/include/__cxx03/__math/traits.h
@@ -109,14 +109,21 @@ _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnan(long double __x) _NOEX
 
 // isnormal
 
-template <class _A1, __enable_if_t<is_floating_point<_A1>::value, int> = 0>
+template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool isnormal(_A1 __x) _NOEXCEPT {
+  return __x != 0;
+}
+
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(float __x) _NOEXCEPT {
   return __builtin_isnormal(__x);
 }
 
-template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
-_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool isnormal(_A1 __x) _NOEXCEPT {
-  return __x != 0;
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(double __x) _NOEXCEPT {
+  return __builtin_isnormal(__x);
+}
+
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(long double __x) _NOEXCEPT {
+  return __builtin_isnormal(__x);
 }
 
 // isgreater
diff --git a/libcxx/test/std/numerics/c.math/isnormal.pass.cpp b/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
index 03b086fa3f48e..76c3d13520d99 100644
--- a/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
+++ b/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
@@ -11,8 +11,6 @@
 // We don't control the implementation on windows
 // UNSUPPORTED: windows
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
 #include <cassert>
 #include <cmath>
 #include <limits>