diff --git a/tasks/capture_lv_device_details.yml b/tasks/capture_lv_device_details.yml
index b80c086..4145431 100644
--- a/tasks/capture_lv_device_details.yml
+++ b/tasks/capture_lv_device_details.yml
@@ -110,7 +110,7 @@
 
 - name: Subtract one additional PE for shrinking
   ansible.builtin.set_fact:
-    bigboot_lv_shrink_size: "{{ bigboot_lv_shrink_size | int - bigboot_lv_vg_pe_size | int }}"
+    bigboot_lv_shrink_size: "{{ bigboot_lv_shrink_size | int - (bigboot_lv_vg_pe_size | int * 2) }}"
   when:
     - bigboot_size_target_fallback | human_to_bytes < bigboot_size_target | human_to_bytes