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-rw-r--r--src/multibyte/mbsrtowcs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/multibyte/mbsrtowcs.c b/src/multibyte/mbsrtowcs.c
index b9bbc33d..066cce60 100644
--- a/src/multibyte/mbsrtowcs.c
+++ b/src/multibyte/mbsrtowcs.c
@@ -59,7 +59,7 @@ resume0:
 			return wn0;
 		}
 		if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
-			while (wn>=4 && !(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
+			while (wn>=5 && !(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
 				*ws++ = *s++;
 				*ws++ = *s++;
 				*ws++ = *s++;