diff --git a/wcsmbs/Makefile b/wcsmbs/Makefile
index a58d36ff8f..cdd8dd5c50 100644
--- a/wcsmbs/Makefile
+++ b/wcsmbs/Makefile
@@ -42,7 +42,7 @@ routines := wcscat wcschr wcscmp wcscpy wcscspn wcsdup wcslen wcsncat \
 	    wcsmbsload mbsrtowcs_l \
 	    isoc99_wscanf isoc99_vwscanf isoc99_fwscanf isoc99_vfwscanf \
 	    isoc99_swscanf isoc99_vswscanf \
-	    mbrtoc16 c16rtomb
+	    mbrtoc16 c16rtomb mbrtoc32 c32rtomb
 
 strop-tests :=  wcscmp wcsncmp wmemcmp wcslen wcschr wcsrchr wcscpy wcsnlen \
 		wcpcpy wcsncpy wcpncpy wcscat wcsncat wcschrnul wcsspn wcspbrk \
@@ -51,7 +51,7 @@ tests := tst-wcstof wcsmbs-tst1 tst-wcsnlen tst-btowc tst-mbrtowc \
 	 tst-wcrtomb tst-wcpncpy tst-mbsrtowcs tst-wchar-h tst-mbrtowc2 \
 	 tst-c16c32-1 wcsatcliff tst-wcstol-locale tst-wcstod-nan-locale \
 	 tst-wcstod-round test-char-types tst-fgetwc-after-eof \
-	 tst-wcstod-nan-sign tst-c16-surrogate \
+	 tst-wcstod-nan-sign tst-c16-surrogate tst-c32-state \
 	 $(addprefix test-,$(strop-tests))
 
 include ../Rules
@@ -70,6 +70,7 @@ $(objpfx)wcsmbs-tst1.out: $(gen-locales)
 $(objpfx)tst-wcstol-locale.out: $(gen-locales)
 $(objpfx)tst-wcstod-nan-locale.out: $(gen-locales)
 $(objpfx)tst-c16-surrogate.out: $(gen-locales)
+$(objpfx)tst-c32-state.out: $(gen-locales)
 endif
 
 $(objpfx)tst-wcstod-round: $(libm)
diff --git a/wcsmbs/c32rtomb.c b/wcsmbs/c32rtomb.c
new file mode 100644
index 0000000000..f370ae28ad
--- /dev/null
+++ b/wcsmbs/c32rtomb.c
@@ -0,0 +1,32 @@
+/* Convert char32_t to multibyte.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <uchar.h>
+#include <wchar.h>
+
+
+/* This is the private state used if PS is NULL.  */
+static mbstate_t state;
+
+size_t
+c32rtomb (char *s, char32_t c32, mbstate_t *ps)
+{
+  if (ps == NULL)
+    ps = &state;
+  return wcrtomb (s, c32, ps);
+}
diff --git a/wcsmbs/mbrtoc32.c b/wcsmbs/mbrtoc32.c
new file mode 100644
index 0000000000..d3f6ef8e5d
--- /dev/null
+++ b/wcsmbs/mbrtoc32.c
@@ -0,0 +1,32 @@
+/* Convert multibyte to char32_t.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <uchar.h>
+#include <wchar.h>
+
+
+/* This is the private state used if PS is NULL.  */
+static mbstate_t state;
+
+size_t
+mbrtoc32 (char32_t *pc32, const char *s, size_t n, mbstate_t *ps)
+{
+  if (ps == NULL)
+    ps = &state;
+  return mbrtowc ((wchar_t *) pc32, s, n, ps);
+}
diff --git a/wcsmbs/mbrtowc.c b/wcsmbs/mbrtowc.c
index 954933d068..410f6855cd 100644
--- a/wcsmbs/mbrtowc.c
+++ b/wcsmbs/mbrtowc.c
@@ -122,8 +122,3 @@ __mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
 libc_hidden_def (__mbrtowc)
 weak_alias (__mbrtowc, mbrtowc)
 libc_hidden_weak (mbrtowc)
-
-/* There should be no difference between the UTF-32 handling required
-   by mbrtoc32 and the wchar_t handling which has long since been
-   implemented in mbrtowc.  */
-weak_alias (__mbrtowc, mbrtoc32)
diff --git a/wcsmbs/tst-c32-state.c b/wcsmbs/tst-c32-state.c
new file mode 100644
index 0000000000..68f646c801
--- /dev/null
+++ b/wcsmbs/tst-c32-state.c
@@ -0,0 +1,44 @@
+/* Test mbrtowc and mbrtoc32 do not share state (bug 23793).
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <locale.h>
+#include <uchar.h>
+#include <wchar.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
+  const char buf[] = "\u00ff";
+  wchar_t wc = 0;
+  char32_t c32 = 0;
+  size_t ret = mbrtowc (&wc, buf, 1, NULL);
+  TEST_COMPARE (ret, (size_t) -2);
+  ret = mbrtoc32 (&c32, buf, 1, NULL);
+  TEST_COMPARE (ret, (size_t) -2);
+  ret = mbrtowc (&wc, buf + 1, 1, NULL);
+  TEST_COMPARE (ret, 1);
+  TEST_COMPARE (wc, 0xff);
+  ret = mbrtoc32 (&c32, buf + 1, 1, NULL);
+  TEST_COMPARE (ret, 1);
+  TEST_COMPARE (c32, 0xff);
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/wcsmbs/wcrtomb.c b/wcsmbs/wcrtomb.c
index 23f122599a..b10295e939 100644
--- a/wcsmbs/wcrtomb.c
+++ b/wcsmbs/wcrtomb.c
@@ -113,8 +113,3 @@ __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
 }
 weak_alias (__wcrtomb, wcrtomb)
 libc_hidden_weak (wcrtomb)
-
-/* There should be no difference between the UTF-32 handling required
-   by c32rtomb and the wchar_t handling which has long since been
-   implemented in wcrtomb.  */
-weak_alias (__wcrtomb, c32rtomb)
