diff --git a/changelogs/fragments/bigboot-internal-variable-names.yml b/changelogs/fragments/bigboot-internal-variable-names.yml
new file mode 100644
index 0000000..dbdc56c
--- /dev/null
+++ b/changelogs/fragments/bigboot-internal-variable-names.yml
@@ -0,0 +1,2 @@
+minor_changes:
+- bigboot - Rename internal variables with role name prefix
\ No newline at end of file
diff --git a/roles/bigboot/tasks/get_boot_device_info.yml b/roles/bigboot/tasks/get_boot_device_info.yml
index 7b63205..b8e941e 100644
--- a/roles/bigboot/tasks/get_boot_device_info.yml
+++ b/roles/bigboot/tasks/get_boot_device_info.yml
@@ -1,20 +1,20 @@
 - name: Find the boot mount entry
   ansible.builtin.set_fact:
-    _boot_mount_entry: "{{ ansible_facts.mounts | selectattr('mount', 'equalto', '/boot') | first }}"
+    bigboot_boot_mount_entry: "{{ ansible_facts.mounts | selectattr('mount', 'equalto', '/boot') | first }}"
 
 - name: Calculate the partition to look for
   ansible.builtin.set_fact:
-    _boot_partition_name: "{{ (_boot_mount_entry.device | split('/'))[-1] }}"
+    bigboot_boot_partition_name: "{{ (bigboot_boot_mount_entry.device | split('/'))[-1] }}"
 
 - name: Find the boot device parent
   ansible.builtin.set_fact:
-    _boot_disk: "{{ item.key }}"
+    bigboot_boot_disk: "{{ item.key }}"
   with_dict: "{{ ansible_facts.devices }}"
-  when: _boot_partition_name in item.value.partitions
+  when: bigboot_boot_partition_name in item.value.partitions
 
 - name: Capture boot device details
   ansible.builtin.set_fact:
-    boot_device_partition_prefix: "{{ _boot_partition_name[(_boot_disk | length) : -1] }}"
-    boot_partition_number: "{{ _boot_partition_name[-1] }}"
-    boot_device_name: "/dev/{{ _boot_disk }}"
-    boot_device_original_size: "{{ _boot_mount_entry.size_total | int }}"
+    bigboot_boot_device_partition_prefix: "{{ bigboot_boot_partition_name[(bigboot_boot_disk | length) : -1] }}"
+    bigboot_boot_partition_number: "{{ bigboot_boot_partition_name[-1] }}"
+    bigboot_boot_device_name: "/dev/{{ bigboot_boot_disk }}"
+    bigboot_boot_device_original_size: "{{ bigboot_boot_mount_entry.size_total | int }}"
diff --git a/roles/bigboot/tasks/main.yaml b/roles/bigboot/tasks/main.yaml
index 3b819a8..65f4e29 100644
--- a/roles/bigboot/tasks/main.yaml
+++ b/roles/bigboot/tasks/main.yaml
@@ -57,14 +57,10 @@
 
 - name: Capture boot device new size
   ansible.builtin.set_fact:
-    boot_device_new_size: "{{ (ansible_facts.mounts | selectattr('mount', 'equalto', '/boot') | first).size_total | int }}"
-
-- name: Capture expected device size
-  ansible.builtin.set_fact:
-    expected_size: "{{ (bigboot_size | human_to_bytes | int) + (boot_device_original_size | int) }}"
+    bigboot_boot_device_new_size: "{{ (ansible_facts.mounts | selectattr('mount', 'equalto', '/boot') | first).size_total | int }}"
 
 - name: Validate boot partition new size
   ansible.builtin.assert:
     that:
-    - boot_device_new_size != boot_device_original_size
-    fail_msg: "Boot partition size '{{ boot_device_new_size }}' did not change"
+    - bigboot_boot_device_new_size != bigboot_boot_device_original_size
+    fail_msg: "Boot partition size '{{ bigboot_boot_device_new_size }}' did not change"
diff --git a/roles/bigboot/templates/increase-boot-partition.sh.j2 b/roles/bigboot/templates/increase-boot-partition.sh.j2
index 35075fd..c18bcd2 100644
--- a/roles/bigboot/templates/increase-boot-partition.sh.j2
+++ b/roles/bigboot/templates/increase-boot-partition.sh.j2
@@ -17,12 +17,12 @@ main() {
     start=$(/usr/bin/date +%s)
     disable_lvm_lock
     # run bigboot.sh to increase boot partition and file system size
-    ret=$(sh /usr/bin/bigboot.sh -d="{{ boot_device_name }}" -s="{{ bigboot_size }}" -b="{{ boot_partition_number }}" -p="{{ boot_device_partition_prefix }}" 2>/dev/kmsg)
+    ret=$(sh /usr/bin/bigboot.sh -d="{{ bigboot_boot_device_name }}" -s="{{ bigboot_size }}" -b="{{ bigboot_boot_partition_number }}" -p="{{ bigboot_boot_device_partition_prefix }}" 2>/dev/kmsg)
     status=$?
     end=$(/usr/bin/date +%s)
     # write the log file
     if [[ $status -eq 0 ]]; then
-        echo "[$name] Boot partition {{ boot_device_name }} successfully increased by {{ bigboot_size }} ("$((end-start))" seconds) " >/dev/kmsg
+        echo "[$name] Boot partition {{ bigboot_boot_device_name }} successfully increased by {{ bigboot_size }} ("$((end-start))" seconds) " >/dev/kmsg
     else
         echo "[$name] Failed to extend boot partition: $ret ("$((end-start))" seconds)" >/dev/kmsg
     fi