diff --git a/install.sh b/install.sh
index 0374393..bda536d 100755
--- a/install.sh
+++ b/install.sh
@@ -5,7 +5,7 @@
 # Copyright (c) 2024 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
-if [[ ! -f /usr/local/etc/pdns.conf ]]; then
+if [[ ! -f /usr/local/sbin/pdns.sh ]] || [[ ! -f /usr/local/etc/pdns.conf ]]; then
   echo "powerdns-tools must be installed and configured first."
   echo "See https://git.stack-source.com/msb/powerdns-tools"
   exit