diff --git a/packer/scripts/enable-vmware-customization.sh b/packer/scripts/enable-vmware-customization.sh
index 4b6f2c0..fba2c01 100644
--- a/packer/scripts/enable-vmware-customization.sh
+++ b/packer/scripts/enable-vmware-customization.sh
@@ -1,4 +1,8 @@
 #!/bin/bash -eu
 echo '>> Enabling legacy VMware Guest Customization...'
-echo 'disable_vmware_customization: true' | sudo tee -a /etc/cloud/cloud.cfg
+if grep -q 'disable_vmware_customization' /etc/cloud/cloud.cfg; then
+  sudo sed -i 's/^disable_vmware_customization:.*$/disable_vmware_customization: True/' /etc/cloud/cloud.cfg
+else
+  echo 'disable_vmware_customization: true' | sudo tee -a /etc/cloud/cloud.cfg
+fi
 sudo vmware-toolbox-cmd config set deployPkg enable-custom-scripts true
diff --git a/packer/scripts/persist-cloud-init-net.sh b/packer/scripts/persist-cloud-init-net.sh
index 005a6ad..9a50d4b 100644
--- a/packer/scripts/persist-cloud-init-net.sh
+++ b/packer/scripts/persist-cloud-init-net.sh
@@ -1,3 +1,7 @@
 #!/bin/sh -eu
 echo '>> Preserving network settings...'
-echo 'manual_cache_clean: True' | sudo tee -a /etc/cloud/cloud.cfg
\ No newline at end of file
+if grep -q 'manual_cache_clean' /etc/cloud/cloud.cfg; then
+  sudo sed -i 's/^manual_cache_clean.*$/manual_cache_clean: True/' /etc/cloud/cloud.cfg
+else
+  echo 'manual_cache_clean: True' | sudo tee -a /etc/cloud/cloud.cfg
+fi
\ No newline at end of file