diff --git a/common.sh b/common.sh
index dd67649f..7c616707 100755
--- a/common.sh
+++ b/common.sh
@@ -20,6 +20,7 @@ get_asn(){
 }
 
 prepare_data_v4(){
+	rm -f rib.gz
 	bgpkit-broker latest -c rrc00 --json | jq -c '.[] | select( .data_type | contains("rib")) | .url' | head -n 1 | xargs axel -q -o rib.gz
 	stat rib.gz
 	log_info "runing bgpdump v4 ..."
@@ -28,6 +29,7 @@ prepare_data_v4(){
 	log_info "finish bgpdump v4"
 }
 prepare_data_v6(){
+	rm -f rib6.gz
 	bgpkit-broker latest -c route-views6 --json | jq -c '.[] | select( .data_type | contains("rib")) | .url' | head -n 1 | xargs axel -q -o rib6.bz2
 	stat rib6.bz2
 	log_info "runing bgpdump v6 ..."