diff --git a/first-network/byfn.sh b/first-network/byfn.sh
index 78f173c1..3f3eee98 100755
--- a/first-network/byfn.sh
+++ b/first-network/byfn.sh
@@ -201,7 +201,9 @@ function generateCerts (){
   echo "##########################################################"
   echo "##### Generate certificates using cryptogen tool #########"
   echo "##########################################################"
-
+  if [ -d "crypto-config" ]; then
+    rm -Rf crypto-config
+  fi
   cryptogen generate --config=./crypto-config.yaml
   if [ "$?" -ne 0 ]; then
     echo "Failed to generate certificates..."