diff -urp zip30/fileio.c zip30/fileio.c
--- zip30/fileio.c	2008-05-29 03:13:24.000000000 +0300
+++ zip30/fileio.c	2023-05-02 12:19:50.488314853 +0300
@@ -3502,7 +3502,7 @@ zwchar *local_to_wide_string(local_strin
   if ((wc_string = (wchar_t *)malloc((wsize + 1) * sizeof(wchar_t))) == NULL) {
     ZIPERR(ZE_MEM, "local_to_wide_string");
   }
-  wsize = mbstowcs(wc_string, local_string, strlen(local_string) + 1);
+  wsize = mbstowcs(wc_string, local_string, wsize + 1);
   wc_string[wsize] = (wchar_t) 0;
 
   /* in case wchar_t is not zwchar */