diff --git a/include/extern.h b/include/extern.h
index abea20a68..5812366f2 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -1932,7 +1932,7 @@ E void VDECL(verbalize, (const char *, ...)) PRINTF_F(1, 2);
 E void VDECL(raw_printf, (const char *, ...)) PRINTF_F(1, 2);
 E void VDECL(impossible, (const char *, ...)) PRINTF_F(1, 2);
 E void VDECL(config_error_add, (const char *, ...)) PRINTF_F(1, 2);
-E void FDECL(nhassert_failed, (const char *, int));
+E void FDECL(nhassert_failed, (const char *, const char *, int));
 
 /* ### polyself.c ### */
 
diff --git a/include/global.h b/include/global.h
index 1bcc2ae5d..ada34523c 100644
--- a/include/global.h
+++ b/include/global.h
@@ -378,7 +378,7 @@ struct savefile_info {
 /* Supply nhassert macro if not supplied by port */
 #ifndef nhassert
 #define nhassert(expression) (void)((!!(expression)) || \
-        (nhassert_failed(__FILE__, __LINE__), 0))
+        (nhassert_failed(#expression, __FILE__, __LINE__), 0))
 #endif
 
 #endif /* GLOBAL_H */
diff --git a/include/ntconf.h b/include/ntconf.h
index 0c76ed718..62c269bab 100644
--- a/include/ntconf.h
+++ b/include/ntconf.h
@@ -134,8 +134,6 @@ extern void NDECL(getlock);
 #ifndef HAS_STDINT_H
 #define HAS_STDINT_H    /* force include of stdint.h in integer.h */
 #endif
-/* Turn on some additional warnings */
-#pragma warning(3:4389)
 #endif /* _MSC_VER */
 
 /* The following is needed for prototypes of certain functions */
@@ -272,14 +270,4 @@ extern int FDECL(alternative_palette, (char *));
 #define nethack_enter(argc, argv) nethack_enter_winnt()
 extern void FDECL(nethack_exit, (int)) NORETURN;
 extern boolean FDECL(file_exists, (const char *));
-
-/* Override the default version of nhassert.  The default version is unable
- * to generate a string form of the expression due to the need to be
- * compatible with compilers which do not support macro stringization (i.e.
- * #x to turn x into its string form).
- */
-extern void FDECL(nt_assert_failed, (const char *, const char *, int));
-#define nhassert(expression) (void)((!!(expression)) || \
-        (nt_assert_failed(#expression, __FILE__, __LINE__), 0))
-
 #endif /* NTCONF_H */
diff --git a/src/pline.c b/src/pline.c
index 91e825963..535b75e95 100644
--- a/src/pline.c
+++ b/src/pline.c
@@ -583,20 +583,9 @@ VA_DECL(const char *, str)
 }
 
 /* nhassert_failed is called when an nhassert's condition is false */
-void
-nhassert_failed(filepath, line)
-    const char * filepath;
-    int line;
+void nhassert_failed(const char * exp, const char * file, int line)
 {
-    const char * filename;
-
-    /* attempt to get filename from path.  TODO: we really need a port provided
-     * function to return a filename from a path */
-    filename = strrchr(filepath, '/');
-    filename = (filename == NULL ? strrchr(filepath, '\\') : filename);
-    filename = (filename == NULL ? filepath : filename + 1);
-
-    impossible("nhassert failed in file '%s' at line %d", filename, line);
+    impossible("NHASSERT(%s) in '%s' at line %d", exp, file, line);
 }
 
 /*pline.c*/
diff --git a/sys/winnt/winnt.c b/sys/winnt/winnt.c
index 8d513c59e..0e19e1f76 100644
--- a/sys/winnt/winnt.c
+++ b/sys/winnt/winnt.c
@@ -708,23 +708,6 @@ sys_random_seed(VOID_ARGS)
     }
     return ourseed;
 }
-
-/* nt_assert_failed is called when an nhassert's condition is false */
-void
-nt_assert_failed(expression, filepath, line)
-    const char * expression;
-    const char * filepath;
-    int line;
-{
-    const char * filename;
-
-    /* get file name from path */
-    filename = strrchr(filepath, '\\');
-    filename = (filename == NULL ? filepath : filename + 1);
-    impossible("nhassert(%s) failed in file '%s' at line %d",
-                expression, filename, line);
-}
-
 #endif /* WIN32 */
 
 /*winnt.c*/