diff --git a/.env.example b/.env.example
index e82ac0f..f27604b 100644
--- a/.env.example
+++ b/.env.example
@@ -55,5 +55,10 @@ PROCESSOR_INSTANCE_ID=processor-1
 # Shared
 # ---------------------------------------------------------------------
 
+# Redis Stream name carrying normalized Position records from
+# tcp-ingestion to processor. Both services must use the same value.
+# Override only if migrating to a new stream (e.g. for multi-vendor).
+REDIS_TELEMETRY_STREAM=telemetry:teltonika
+
 # pino log level: fatal | error | warn | info | debug | trace
 LOG_LEVEL=info
diff --git a/compose.yaml b/compose.yaml
index b7bfccd..c010259 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -53,6 +53,10 @@ services:
       NODE_ENV: production
       INSTANCE_ID: ${TCP_INGESTION_INSTANCE_ID:-stage-1}
       REDIS_URL: redis://redis:6379
+      # Pinned explicitly here to keep tcp-ingestion and processor in sync;
+      # neither service's compiled default is authoritative — the deploy
+      # stack is the single source of truth for the stream name.
+      REDIS_TELEMETRY_STREAM: ${REDIS_TELEMETRY_STREAM:-telemetry:teltonika}
       LOG_LEVEL: ${LOG_LEVEL:-info}
     restart: unless-stopped
 
@@ -102,6 +106,9 @@ services:
       NODE_ENV: production
       INSTANCE_ID: ${PROCESSOR_INSTANCE_ID:-processor-1}
       REDIS_URL: redis://redis:6379
+      # Must match tcp-ingestion's REDIS_TELEMETRY_STREAM — both pinned
+      # to the same shared variable so they cannot drift.
+      REDIS_TELEMETRY_STREAM: ${REDIS_TELEMETRY_STREAM:-telemetry:teltonika}
       POSTGRES_URL: postgres://${POSTGRES_USER:-trm}:${POSTGRES_PASSWORD:-trm-pilot-change-me}@postgres:5432/${POSTGRES_DB:-trm}
       LOG_LEVEL: ${LOG_LEVEL:-info}
     restart: unless-stopped