diff --git a/scripts/ingest-tarball.sh b/scripts/ingest-tarball.sh
index 9a2580d2..952c8629 100755
--- a/scripts/ingest-tarball.sh
+++ b/scripts/ingest-tarball.sh
@@ -182,7 +182,10 @@ function update_lmod_caches() {
         error "the script for updating the Lmod caches (${update_caches_script}) does not have execute permissions!"
     fi
     ${cvmfs_server} transaction "${cvmfs_repo}"
-    ${update_caches_script} "${CVMFS_ROOT}/${cvmfs_repo}/${basedir}/${version}"
+    # Find the oldest version that we have, and use its Lmod to generate the cache to get better backwards compatibilty with old Lmod versions
+    oldest_stack=$(ls -1 -v "${CVMFS_ROOT}/${cvmfs_repo}/${basedir}" | head -n 1)
+    oldest_stack_lmod_update_script="${CVMFS_ROOT}/${cvmfs_repo}/${basedir}/${oldest_stack}/compat/linux/$(uname -m)/usr/share/Lmod/libexec/update_lmod_system_cache_files"
+    ${update_caches_script} "${CVMFS_ROOT}/${cvmfs_repo}/${basedir}/${version}" "${oldest_stack_lmod_update_script}"
     ec=$?
     if [ $ec -eq 0 ]; then
         ${cvmfs_server} publish -m "update Lmod caches after ingesting ${tar_file_basename}" "${cvmfs_repo}"
diff --git a/scripts/update_lmod_caches.sh b/scripts/update_lmod_caches.sh
index 70737123..79ba632d 100755
--- a/scripts/update_lmod_caches.sh
+++ b/scripts/update_lmod_caches.sh
@@ -14,11 +14,12 @@ function error() {
 }
 
 # Check if a stack base dir has been specified
-if [ "$#" -ne 1 ]; then
-    error "usage: $0 <path to main directory of an EESSI stack>"
+if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
+    error "usage: $0 <path to main directory of an EESSI stack> [<path to Lmod's update_lmod_system_cache_files script>]"
 fi
 
 stack_base_dir="$1"
+update_lmod_system_cache_files="$2"
 
 # Check if the given stack base dir exists
 if [ ! -d ${stack_base_dir} ]
@@ -26,8 +27,11 @@ then
   error "${stack_base_dir} does not point to an existing directory!"
 fi
 
-# Check if Lmod's cache update script can be found at the expected location (in the compatibility layer of the given stack)
-update_lmod_system_cache_files="${stack_base_dir}/compat/linux/$(uname -m)/usr/share/Lmod/libexec/update_lmod_system_cache_files"
+# If no Lmod cache update script was specified, try to find one in the compatibility layer of the given stack
+if [ -z ${update_lmod_system_cache_files} ]; then
+  update_lmod_system_cache_files="${stack_base_dir}/compat/linux/$(uname -m)/usr/share/Lmod/libexec/update_lmod_system_cache_files"
+fi
+# Make sure that the expected Lmod cache update script exists
 if [ ! -f ${update_lmod_system_cache_files} ]
 then
   error "expected to find Lmod's cache update script at ${update_lmod_system_cache_files}, but it doesn't exist."