diff -Nru casper-1.469/debian/changelog casper-1.470/debian/changelog
--- casper-1.469/debian/changelog	2022-04-14 13:04:19.000000000 +0000
+++ casper-1.470/debian/changelog	2022-04-15 16:00:44.000000000 +0000
@@ -1,3 +1,10 @@
+casper (1.470) jammy; urgency=medium
+
+  * Add missing include of casper-helpers, needed by the iso-scan script.
+    LP: #1960457.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 15 Apr 2022 16:00:44 +0000
+
 casper (1.469) jammy; urgency=medium
 
   * Integrate lupin-casper's 20iso_scan casper-premount script so that users
diff -Nru casper-1.469/scripts/casper-premount/20iso_scan casper-1.470/scripts/casper-premount/20iso_scan
--- casper-1.469/scripts/casper-premount/20iso_scan	2022-04-14 13:04:19.000000000 +0000
+++ casper-1.470/scripts/casper-premount/20iso_scan	2022-04-15 15:59:57.000000000 +0000
@@ -16,6 +16,7 @@
 esac
 
 . /scripts/casper-functions
+. /scripts/casper-helpers
 
 iso_path=
 for x in $(cat /proc/cmdline); do