diff --git a/README.md b/README.md
index e0d4314..36a12ce 100644
--- a/README.md
+++ b/README.md
@@ -5,15 +5,15 @@ A tool to sync dates of birth in Immich from a CardDAV server.
 
 Configuration is provided via environment variables (`.env` file is supported).
 
-| Name                               | Description                                    |
-|------------------------------------|------------------------------------------------|
-| IMMICH_CARDDAV_CARDDAV_URL         | URL to the CardDAV server                      |
-| IMMICH_CARDDAV_CARDDAV_ADDRESSBOOK | Address book name or ID in the CardDAV server. |
-| IMMICH_CARDDAV_CARDDAV_USERNAME    | Username of CardDAV server                     |
-| IMMICH_CARDDAV_CARDDAV_PASSWORD    | Password of CardDAV server                     |
-| IMMICH_CARDDAV_IMMICH_API_URL      | Immich instance API URL (including "/api")     |
-| IMMICH_CARDDAV_IMMICH_API_KEY      | Immich API key                                 |
-| IMMICH_CARDDAV_CRON_EXPRESSION     | Cron expression (only for daemon image)        |
+| Name                             | Description                                    |
+|----------------------------------|------------------------------------------------|
+| CARDDAV_SYNC_CARDDAV_URL         | URL to the CardDAV server                      |
+| CARDDAV_SYNC_CARDDAV_ADDRESSBOOK | Address book name or ID in the CardDAV server. |
+| CARDDAV_SYNC_CARDDAV_USERNAME    | Username of CardDAV server                     |
+| CARDDAV_SYNC_CARDDAV_PASSWORD    | Password of CardDAV server                     |
+| CARDDAV_SYNC_IMMICH_API_URL      | Immich instance API URL (including "/api")     |
+| CARDDAV_SYNC_IMMICH_API_KEY      | Immich API key                                 |
+| CARDDAV_SYNC_CRON_EXPRESSION     | Cron expression (only for daemon image)        |
 
 Environment variable LOG_LEVEL will configure the logging level (standard Python logging levels: DEBUG, INFO, WARNING,
 ERROR, CRITICAL).
diff --git a/immich_carddav_sync/config.py b/immich_carddav_sync/config.py
index 993c1b6..dc158d8 100644
--- a/immich_carddav_sync/config.py
+++ b/immich_carddav_sync/config.py
@@ -11,7 +11,7 @@ class Settings(BaseSettings):
     carddav_password: str
 
     class Config:
-        env_prefix = "IMMICH_CARDDAV_"
+        env_prefix = "CARDDAV_SYNC_"
         env_file = ".env"
         case_sensitive = False