diff --git a/brewblox_tilt/models.py b/brewblox_tilt/models.py
index aa6317a..612747b 100644
--- a/brewblox_tilt/models.py
+++ b/brewblox_tilt/models.py
@@ -1,13 +1,13 @@
 from typing import Literal
 
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class ServiceConfig(BaseSettings):
     model_config = SettingsConfigDict(
         env_file='.appenv',
-        env_prefix='brewblox_',
+        env_prefix='brewblox_tilt_',
         case_sensitive=False,
         json_schema_extra='ignore',
     )
@@ -24,7 +24,7 @@ class ServiceConfig(BaseSettings):
     scan_duration: float = 5
     inactive_scan_interval: float = 5
     active_scan_interval: float = 10
-    simulate: list[str] | None = None
+    simulate: list[str] = Field(default_factory=list)
 
 
 class TiltEvent(BaseModel):
diff --git a/docker-compose.yml b/docker-compose.yml
index e67f668..4b26291 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -9,9 +9,9 @@ services:
     image: ghcr.io/brewblox/brewblox-tilt:local
     privileged: true
     environment:
-      - BREWBLOX_DEBUG=True
       - UVICORN_RELOAD=True
-      # - BREWBLOX_SIMULATE=["Mauve", "Lila"]
+      - BREWBLOX_TILT_DEBUG=True
+      # - BREWBLOX_TILT_SIMULATE=["Mauve","Lila"]
     restart: unless-stopped
     volumes:
       - type: bind
diff --git a/parse_appenv.py b/parse_appenv.py
index e7885d2..7f9b7e3 100644
--- a/parse_appenv.py
+++ b/parse_appenv.py
@@ -30,7 +30,7 @@ def parse_cmd_args(raw_args: list[str]) -> tuple[argparse.Namespace, list[str]]:
     args, unknown = parse_cmd_args(sys.argv[1:])
     if unknown:
         print(f'WARNING: ignoring unknown CMD arguments: {unknown}', file=sys.stderr)
-    output = [f'brewblox_{k}={shlex.quote(str(v))}'
+    output = [f'brewblox_tilt_{k}={shlex.quote(str(v))}'
               for k, v in vars(args).items()
               if v is not None
               and v is not False
@@ -40,4 +40,4 @@ def parse_cmd_args(raw_args: list[str]) -> tuple[argparse.Namespace, list[str]]:
     # Special exception for list variables
     if args.simulate:
         sim_names = json.dumps(list(args.simulate))
-        print(f"brewblox_simulate='{sim_names}'")
+        print(f"brewblox_tilt_simulate='{sim_names}'")