diff --git a/scripts/install.sh b/scripts/install.sh
index 37055e51c..123861c22 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -144,7 +144,7 @@ installAndDownloadArtifact() {
 firezoneSetup() {
   conf="/opt/firezone/embedded/cookbooks/firezone/attributes/default.rb"
   sudo sed -i "s/firezone@localhost/$1/" $conf
-  sudo sed -i "s/default\['firezone']\['external_url'].*/default['firezone']['external_url'] = 'https://$public_ip'/" $conf
+  sudo sed -i "s/default\['firezone']\['external_url'].*/default['firezone']['external_url'] = 'https:\/\/$public_ip'/" $conf
   sudo firezone-ctl reconfigure
   sudo firezone-ctl create-or-reset-admin
 }