--- a/phc2sys.c
+++ b/phc2sys.c
@@ -352,12 +352,14 @@ static int is_msg_mgt(struct ptp_message *msg)
 
 static int get_mgt_id(struct ptp_message *msg)
 {
-	return ((struct management_tlv *) msg->management.suffix)->id;
+	struct management_tlv *mgt = (struct management_tlv *) msg->management.suffix;
+	return mgt->id;
 }
 
 static void *get_mgt_data(struct ptp_message *msg)
 {
-	return ((struct management_tlv *) msg->management.suffix)->data;
+	struct management_tlv *mgt = (struct management_tlv *) msg->management.suffix;
+	return mgt->data;
 }
 
 static int run_pmc(int wait_sync, int *utc_offset)