diff --git a/Misc/NEWS b/Misc/NEWS
index 159dd6d..57c6fff 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -114,6 +114,8 @@
 Extension Modules
 -----------------
 
+- Issue #4365: Add crtassem.h constants to the msvcrt module.
+
 - Issue #4396: The parser module now correctly validates the with statement.
 
 
diff --git a/PC/msvcrtmodule.c b/PC/msvcrtmodule.c
index 95e369b..cad22b1 100755
--- a/PC/msvcrtmodule.c
+++ b/PC/msvcrtmodule.c
@@ -22,6 +22,12 @@
 #include <conio.h>
 #include <sys/locking.h>
 
+#ifdef _MSC_VER
+#if _MSC_VER >= 1500
+#include <crtassem.h>
+#endif
+#endif
+
 // Force the malloc heap to clean itself up, and free unused blocks
 // back to the OS.  (According to the docs, only works on NT.)
 static PyObject *
@@ -298,6 +304,7 @@
 PyMODINIT_FUNC
 initmsvcrt(void)
 {
+	int st;
 	PyObject *d;
 	PyObject *m = Py_InitModule("msvcrt", msvcrt_functions);
 	if (m == NULL)
@@ -310,4 +317,21 @@
 	insertint(d, "LK_NBRLCK", _LK_NBRLCK);
 	insertint(d, "LK_RLCK", _LK_RLCK);
 	insertint(d, "LK_UNLCK", _LK_UNLCK);
+
+	/* constants for the crt versions */
+#ifdef _VC_ASSEMBLY_PUBLICKEYTOKEN
+	st = PyModule_AddStringConstant(m, "VC_ASSEMBLY_PUBLICKEYTOKEN",
+					_VC_ASSEMBLY_PUBLICKEYTOKEN);
+	if (st < 0)return;
+#endif
+#ifdef _CRT_ASSEMBLY_VERSION
+	st = PyModule_AddStringConstant(m, "CRT_ASSEMBLY_VERSION",
+					_CRT_ASSEMBLY_VERSION);
+	if (st < 0)return;
+#endif
+#ifdef __LIBRARIES_ASSEMBLY_NAME_PREFIX
+	st = PyModule_AddStringConstant(m, "LIBRARIES_ASSEMBLY_NAME_PREFIX",
+					__LIBRARIES_ASSEMBLY_NAME_PREFIX);
+	if (st < 0)return;
+#endif
 }