diff --git a/package_variants/mainnet/docker-compose.yml b/package_variants/mainnet/docker-compose.yml
index a98e54e..7ca8728 100644
--- a/package_variants/mainnet/docker-compose.yml
+++ b/package_variants/mainnet/docker-compose.yml
@@ -25,6 +25,7 @@ services:
         NETWORK: mainnet
         PGPASSWORD: mainnet
         POSTGRES_DB: web3signer-mainnet
+        POSTGRES_USER: postgres
 
   postgres:
     build:
@@ -33,3 +34,4 @@ services:
         POSTGRES_PASSWORD: mainnet
         PGPASSWORD: mainnet
         POSTGRES_DB: web3signer-mainnet
+        POSTGRES_USER: postgres