diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index dc65b11f09..67bfff42ca 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -6977,7 +6977,7 @@ static int socket_process(struct iax2_thread *thread)
 
 	/* allocate an iax_frame with 4096 bytes of data buffer */
 	fr = alloca(sizeof(*fr) + 4096);
-	fr->callno = 0;
+	memset(fr, 0, sizeof(*fr));
 	fr->afdatalen = 4096; /* From alloca() above */
 
 	/* Copy frequently used parameters to the stack */