diff --git a/lib/apps/nixos-install.sh b/lib/apps/nixos-install.sh
index 05e1116e..bdbadf07 100644
--- a/lib/apps/nixos-install.sh
+++ b/lib/apps/nixos-install.sh
@@ -141,7 +141,9 @@ install() {
 
 ### Pull the trigger
 
-if _read_boolean "Do you want to DELETE ALL PARTITIONS?" N; then
+DO_PARTITION="$(_read_boolean "Do you want to DELETE ALL PARTITIONS?" N)"
+readonly DO_PARTITION
+if "${DO_PARTITION}"; then
     partition
     create_volumes
     create_filesystems
@@ -155,7 +157,9 @@ if [[ ${LVM_PV_NUM_ACTIVE} -lt 1 ]]; then
     decrypt_lvm
 fi
 
-if _read_boolean "Do you want to INSTALL NixOS now?" N; then
+DO_INSTALL="$(_read_boolean "Do you want to INSTALL NixOS now?" N)"
+readonly DO_INSTALL
+if "${DO_INSTALL}"; then
     install
 fi