diff --git a/Dockerfile b/Dockerfile
index 3449ebe..a56d619 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,3 @@
-FROM redis:alpine AS redis-server
-ADD start-redis-server.sh /usr/bin/
-RUN chmod +x /usr/bin/start-redis-server.sh
-CMD ["start-redis-server.sh"]
 
 FROM tootsuite/mastodon:v3.4.1
 ENTRYPOINT []
diff --git a/Dockerfile.redis b/Dockerfile.redis
new file mode 100644
index 0000000..8dcd469
--- /dev/null
+++ b/Dockerfile.redis
@@ -0,0 +1,4 @@
+FROM redis:alpine
+ADD start-redis-server.sh /usr/bin/
+RUN chmod +x /usr/bin/start-redis-server.sh
+CMD ["start-redis-server.sh"]
diff --git a/fly.redis.toml b/fly.redis.toml
index c4a5b9d..f966a7b 100644
--- a/fly.redis.toml
+++ b/fly.redis.toml
@@ -1,5 +1,8 @@
 app = "mastodon-redis"
 
+[build]
+  dockerfile = "Dockerfile.redis"
+
 [[mounts]]
   source = "mastodon_redis"
   destination = "/data"