diff --git a/sim_fio.c b/sim_fio.c
index b600b914..d0b48368 100644
--- a/sim_fio.c
+++ b/sim_fio.c
@@ -1474,7 +1474,7 @@ char *c, *name, *ext;
 char chr;
 const char *p;
 char filesizebuf[32] = "";
-char filedatetimebuf[32] = "";
+char filedatetimebuf[64] = "";
 char namebuf[PATH_MAX + 1];
 
 
@@ -1553,7 +1553,7 @@ if (strchr (parts, 't') ||      /* modification time or */
     else
         sprintf (filesizebuf, "%" LL_FMT "d ", (LL_TYPE)filestat.st_size);
     tm = localtime (&filestat.st_mtime);
-    sprintf (filedatetimebuf, "%02d/%02d/%04d %02d:%02d %cM ", 1 + tm->tm_mon, tm->tm_mday, 1900 + tm->tm_year,
+    snprintf (filedatetimebuf, sizeof (filedatetimebuf), "%02d/%02d/%04d %02d:%02d %cM ", 1 + tm->tm_mon, tm->tm_mday, 1900 + tm->tm_year,
                                                               tm->tm_hour % 12, tm->tm_min, (0 == (tm->tm_hour % 12)) ? 'A' : 'P');
     }
 for (p = parts; *p; p++) {