diff --git a/first-network/byfn.sh b/first-network/byfn.sh
index 46c417351e..78f173c11e 100755
--- a/first-network/byfn.sh
+++ b/first-network/byfn.sh
@@ -161,11 +161,11 @@ function replacePrivateKey () {
   CURRENT_DIR=$PWD
   cd crypto-config/peerOrganizations/org1.example.com/ca/
   PRIV_KEY=$(ls *_sk)
-  cd $CURRENT_DIR
+  cd "$CURRENT_DIR"
   sed $OPTS "s/CA1_PRIVATE_KEY/${PRIV_KEY}/g" docker-compose-e2e.yaml
   cd crypto-config/peerOrganizations/org2.example.com/ca/
   PRIV_KEY=$(ls *_sk)
-  cd $CURRENT_DIR
+  cd "$CURRENT_DIR"
   sed $OPTS "s/CA2_PRIVATE_KEY/${PRIV_KEY}/g" docker-compose-e2e.yaml
   # If MacOSX, remove the temporary backup of the docker-compose file
   if [ "$ARCH" == "Darwin" ]; then