diff --git a/README.md b/README.md
index dcaf5e5..9819422 100644
--- a/README.md
+++ b/README.md
@@ -109,16 +109,16 @@ You need to mount the file   [`env.js`](frontend/public/environment/env.js) in t
 * `PRETIX_URL`
   * The url of the pretix instance
   * Defaults to: `None`
-* `CHECKIN_LIST_ID`
+* `PRETIX_CHECKIN_LIST_ID`
   * The id of the checkin list in pretix
   * Defaults to: `None`
-* `ORGANIZER`
+* `PRETIX_ORGANIZER`
   * The organizer shot name of the event in pretix
   * Defaults to: `None`
-* `EVENT`
+* `PRETIX_EVENT`
   * The event slug of the event in pretix
   * Defaults to: `None`
-* `API_TOKEN`
+* `PRETIX_API_TOKEN`
   * The api token of the pretix instance
   * Defaults to: `None`
 
diff --git a/backend/util.py b/backend/util.py
index 954ac56..ff2765d 100644
--- a/backend/util.py
+++ b/backend/util.py
@@ -74,14 +74,14 @@
 
 pretix_url = os.environ.get("PRETIX_URL") if os.environ.get(
     "PRETIX_URL") else None
-pretix_checkin_list_id = os.environ.get("CHECKIN_LIST_ID") if os.environ.get(
-    "CHECKIN_LIST_ID") else None
-pretix_organizer = os.environ.get("ORGANIZER") if os.environ.get(
-    "ORGANIZER") else None
-pretix_event = os.environ.get("EVENT") if os.environ.get(
-    "EVENT") else None
-pretix_api_token = os.environ.get("API_TOKEN") if os.environ.get(
-    "API_TOKEN") else None
+pretix_checkin_list_id = os.environ.get("PRETIX_CHECKIN_LIST_ID") if os.environ.get(
+    "PRETIX_CHECKIN_LIST_ID") else None
+pretix_organizer = os.environ.get("PRETIX_ORGANIZER") if os.environ.get(
+    "PRETIX_ORGANIZER") else None
+pretix_event = os.environ.get("PRETIX_EVENT") if os.environ.get(
+    "PRETIX_EVENT") else None
+pretix_api_token = os.environ.get("PRETIX_API_TOKEN") if os.environ.get(
+    "PRETIX_API_TOKEN") else None
 
 
 tempfile_path = "tempfiles"