diff --git a/deploy/server/compose.override.yaml b/deploy/server/compose.override.yaml
index d4ac897..6b1adc3 100644
--- a/deploy/server/compose.override.yaml
+++ b/deploy/server/compose.override.yaml
@@ -20,7 +20,7 @@ x-server-backend-environment: &server-backend-environment
   CURSOR_SIGNING_SECRET: ${CURSOR_SIGNING_SECRET}
   SHARE_TOKEN_SIGNING_SECRET: ${SHARE_TOKEN_SIGNING_SECRET}
   EMBEDDING_PROVIDER: local
-  VOICE_PROVIDER: mock
+  VOICE_PROVIDER: ${VOICE_PROVIDER:-mock}
 
 services:
   otel-collector:
@@ -94,8 +94,8 @@ services:
       HTTP_ADDR: 0.0.0.0:8080
       DEVICE_LOCAL_SECRET: ${DEVICE_LOCAL_SECRET}
       RTC_TOKEN_SIGNING_SECRET: ${RTC_TOKEN_SIGNING_SECRET}
-      RTC_TOKEN_ISSUER: local
-      RTC_APP_ID: local-public-rtc-app
+      RTC_TOKEN_ISSUER: ${RTC_TOKEN_ISSUER:-local}
+      RTC_APP_ID: ${RTC_APP_ID:-local-public-rtc-app}
     restart: unless-stopped
 
   callbacks: