1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/isdn/hisax/hisax_isac.c b/drivers/isdn/hisax/hisax_isac.c
index 81eac344bb03..d0fefcf999cb 100644
--- a/drivers/isdn/hisax/hisax_isac.c
+++ b/drivers/isdn/hisax/hisax_isac.c
@@ -433,7 +433,7 @@ static void l1m_debug(struct FsmInst *fi, char *fmt, ...)
         char buf[256];
         
         va_start(args, fmt);
-        vsprintf(buf, fmt, args);
+        vsnprintf(buf, sizeof(buf), fmt, args);
         DBG(DBG_L1M, "%s", buf);
         va_end(args);
 }