diff --git a/src/installer.sh b/src/installer.sh
index 614fea4..3dc24e5 100644
--- a/src/installer.sh
+++ b/src/installer.sh
@@ -58,4 +58,14 @@ run_installer() {
   fi
 
   read -r -p "Press Enter once the installer is complete..." _
+
+  # Verify critical mounts are still intact after installer
+  if ! findmnt "$MOUNT_ROOT" >/dev/null 2>&1; then
+    die "Root mount disappeared after installer. The installer may have reformatted the filesystem."
+  fi
+  if ! findmnt "$ESP_MOUNT" >/dev/null 2>&1; then
+    die "ESP mount disappeared after installer. The installer may have reformatted the filesystem."
+  fi
+
+  log_info "Mount verification passed."
 }