diff --git a/Include/pymacro.h b/Include/pymacro.h
index bfe660e8303d0f..b2886ddac5d17e 100644
--- a/Include/pymacro.h
+++ b/Include/pymacro.h
@@ -73,14 +73,14 @@
# else
# define _Py_ALIGNED_DEF(N, T) alignas(N) alignas(T) T
# endif
+# elif defined(_MSC_VER)
+# define _Py_ALIGNED_DEF(N, T) __declspec(align(N)) T
# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
# define _Py_ALIGNED_DEF(N, T) alignas(N) alignas(T) T
# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
# define _Py_ALIGNED_DEF(N, T) _Alignas(N) _Alignas(T) T
# elif (defined(__GNUC__) || defined(__clang__))
# define _Py_ALIGNED_DEF(N, T) __attribute__((aligned(N))) T
-# elif defined(_MSC_VER)
-# define _Py_ALIGNED_DEF(N, T) __declspec(align(N)) T
# else
# define _Py_ALIGNED_DEF(N, T) _Alignas(N) _Alignas(T) T
# endif
diff --git a/Include/pyport.h b/Include/pyport.h
index 3eac119bf8e8d8..73f071c41a6687 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -49,7 +49,8 @@
// Static inline functions should use _Py_NULL rather than using directly NULL
// to prevent C++ compiler warnings. On C23 and newer and on C++11 and newer,
// _Py_NULL is defined as nullptr.
-#if (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
+#if (defined(__GNUC__) || defined(__clang__)) && \
+ (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
|| (defined(__cplusplus) && __cplusplus >= 201103)
# define _Py_NULL nullptr
#else
diff --git a/Misc/NEWS.d/next/Build/2025-06-25-13-27-14.gh-issue-135927.iCNPQc.rst b/Misc/NEWS.d/next/Build/2025-06-25-13-27-14.gh-issue-135927.iCNPQc.rst
new file mode 100644
index 00000000000000..21a2c87d3448c1
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-06-25-13-27-14.gh-issue-135927.iCNPQc.rst
@@ -0,0 +1 @@
+Fix building with MSVC when passing option ``/std:clatest``.
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index bbbb49115681de..1837de4735c176 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -3148,7 +3148,7 @@ static PyObject *
math_issubnormal_impl(PyObject *module, double x)
/*[clinic end generated code: output=4e76ac98ddcae761 input=9a20aba7107d0d95]*/
{
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#if !defined(_MSC_VER) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
return PyBool_FromLong(issubnormal(x));
#else
return PyBool_FromLong(isfinite(x) && x && !isnormal(x));
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