diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9dcaea3..683e915 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 4.0.12 2023-11-12 <dave at tiredofit dot ca>
+
+   ### Changed
+      - Allow creating schedulers if _MONGO_CUSTOM_URI is set and _DB_HOST blank
+
+
 ## 4.0.11 2023-11-11 <dave at tiredofit dot ca>
 
    ### Changed
diff --git a/install/assets/functions/10-db-backup b/install/assets/functions/10-db-backup
index 33ea3de..b3799a6 100644
--- a/install/assets/functions/10-db-backup
+++ b/install/assets/functions/10-db-backup
@@ -1141,10 +1141,11 @@ create_archive() {
 
 create_schedulers() {
     if var_true "${DEBUG_CREATE_SCHEDULERS}" ; then debug on; fi
+
     backup() {
-        bootstrap_variables upgrade BACKUP
-        local backup_instances=$(printenv | sort | grep -c "^DB[0-9]._HOST")
+        local backup_instances=$(set -o posix ; set | grep -Pc "^(DB[0-9]._HOST=|.*MONGO_CUSTOM_URI=)")
         print_debug "[create_schedulers] Found '${backup_instances}' DB_HOST instances"
+
         if [ -n "${DB_HOST}" ] && [ "${backup_instances}" ]; then
           backup_instances=1;
           print_debug "[create_schedulers] Detected using old DB_ variables"