diff --git a/lib/libc/ansi/mbstowcs.c b/lib/libc/ansi/mbstowcs.c
index 2749cbace..7b2015c91 100644
--- a/lib/libc/ansi/mbstowcs.c
+++ b/lib/libc/ansi/mbstowcs.c
@@ -15,6 +15,6 @@ mbstowcs(register wchar_t *pwcs, register const char *s, size_t n)
 		if (!(*pwcs++ = *s++))
 			return n - i - 1;
 	}
-	return n - i;
+	return n;
 }