diff --git a/drpc-free.yml b/drpc-free.yml
index bc23b92a..19970176 100644
--- a/drpc-free.yml
+++ b/drpc-free.yml
@@ -30,7 +30,7 @@ services:
     restart: unless-stopped
     command:
       - "redis-server"
-      - "--maxmemory ${GW_FREE_REDIS_RAM}"
+      - "--maxmemory ${GW_FREE_REDIS_RAM:-512MB}"
       - "--maxmemory-policy allkeys-lru"
       - '--save ""'
     networks: