3 files changed, 6 insertions, 0 deletions
diff --git a/src/multibyte/c16rtomb.c b/src/multibyte/c16rtomb.c
index 2e8ec970..39ca3758 100644
--- a/src/multibyte/c16rtomb.c
+++ b/src/multibyte/c16rtomb.c
@@ -4,6 +4,8 @@
 
 size_t c16rtomb(char *restrict s, char16_t c16, mbstate_t *restrict ps)
 {
+	static unsigned internal_state;
+	if (!ps) ps = (void *)&internal_state;
 	unsigned *x = (unsigned *)ps;
 	wchar_t wc;
 
diff --git a/src/multibyte/mbrtoc16.c b/src/multibyte/mbrtoc16.c
index 74b7d77e..765ff903 100644
--- a/src/multibyte/mbrtoc16.c
+++ b/src/multibyte/mbrtoc16.c
@@ -3,6 +3,8 @@
 
 size_t mbrtoc16(char16_t *restrict pc16, const char *restrict s, size_t n, mbstate_t *restrict ps)
 {
+	static unsigned internal_state;
+	if (!ps) ps = (void *)&internal_state;
 	unsigned *pending = (unsigned *)ps;
 
 	if (!s) return mbrtoc16(0, "", 1, ps);
diff --git a/src/multibyte/mbrtoc32.c b/src/multibyte/mbrtoc32.c
index c6d20824..9b6b2367 100644
--- a/src/multibyte/mbrtoc32.c
+++ b/src/multibyte/mbrtoc32.c
@@ -3,6 +3,8 @@
 
 size_t mbrtoc32(char32_t *restrict pc32, const char *restrict s, size_t n, mbstate_t *restrict ps)
 {
+	static unsigned internal_state;
+	if (!ps) ps = (void *)&internal_state;
 	if (!s) return mbrtoc32(0, "", 1, ps);
 	wchar_t wc;
 	size_t ret = mbrtowc(&wc, s, n, ps);