diff --git a/Modules/clinic/posixmodule.c.h b/Modules/clinic/posixmodule.c.h
index 6a3aacf13e7..b69817ae9bb 100644
--- a/Modules/clinic/posixmodule.c.h
+++ b/Modules/clinic/posixmodule.c.h
@@ -306,7 +306,7 @@ exit:
     return return_value;
 }
 
-#if defined(HAVE_TTYNAME)
+#if defined(HAVE_TTYNAME_R)
 
 PyDoc_STRVAR(os_ttyname__doc__,
 "ttyname($module, fd, /)\n"
@@ -339,7 +339,7 @@ exit:
     return return_value;
 }
 
-#endif /* defined(HAVE_TTYNAME) */
+#endif /* defined(HAVE_TTYNAME_R) */
 
 #if defined(HAVE_CTERMID)
 
@@ -12879,4 +12879,4 @@ os__is_inputhook_installed(PyObject *module, PyObject *Py_UNUSED(ignored))
 #ifndef OS__SUPPORTS_VIRTUAL_TERMINAL_METHODDEF
     #define OS__SUPPORTS_VIRTUAL_TERMINAL_METHODDEF
 #endif /* !defined(OS__SUPPORTS_VIRTUAL_TERMINAL_METHODDEF) */
-/*[clinic end generated code: output=a4410a686958d8e6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a75be356cd4abca5 input=a9049054013a1b77]*/
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 401160640df..d1d6b247d1e 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -3298,7 +3298,7 @@ os_access_impl(PyObject *module, path_t *path, int mode, int dir_fd,
 #endif
 
 
-#ifdef HAVE_TTYNAME
+#ifdef HAVE_TTYNAME_R
 /*[clinic input]
 os.ttyname
 
diff --git a/configure b/configure
index ff8e29de143..1cd1f690f7b 100755
--- a/configure
+++ b/configure
@@ -18943,10 +18943,10 @@ then :
   printf "%s\n" "#define HAVE_TRUNCATE 1" >>confdefs.h
 
 fi
-ac_fn_c_check_func "$LINENO" "ttyname" "ac_cv_func_ttyname"
-if test "x$ac_cv_func_ttyname" = xyes
+ac_fn_c_check_func "$LINENO" "ttyname_r" "ac_cv_func_ttyname_r"
+if test "x$ac_cv_func_ttyname_r" = xyes
 then :
-  printf "%s\n" "#define HAVE_TTYNAME 1" >>confdefs.h
+  printf "%s\n" "#define HAVE_TTYNAME_R 1" >>confdefs.h
 
 fi
 ac_fn_c_check_func "$LINENO" "umask" "ac_cv_func_umask"
diff --git a/configure.ac b/configure.ac
index dd4e0b4723c..3fcb18922c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5134,7 +5134,7 @@ AC_CHECK_FUNCS([ \
   sigfillset siginterrupt sigpending sigrelse sigtimedwait sigwait \
   sigwaitinfo snprintf splice strftime strlcpy strsignal symlinkat sync \
   sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile \
-  tmpnam tmpnam_r truncate ttyname umask uname unlinkat unlockpt utimensat utimes vfork \
+  tmpnam tmpnam_r truncate ttyname_r umask uname unlinkat unlockpt utimensat utimes vfork \
   wait wait3 wait4 waitid waitpid wcscoll wcsftime wcsxfrm wmemcmp writev \
 ])
 
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 59bbdc1c162..3c16c694c84 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1494,8 +1494,8 @@
 /* Define to 1 if you have the `truncate' function. */
 #undef HAVE_TRUNCATE
 
-/* Define to 1 if you have the `ttyname' function. */
-#undef HAVE_TTYNAME
+/* Define to 1 if you have the `ttyname_r' function. */
+#undef HAVE_TTYNAME_R
 
 /* Define to 1 if you don't have `tm_zone' but do have the external array
    `tzname'. */