diff --git a/config/database.yml b/config/database.yml
index f74635a36..82e560515 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -6,7 +6,7 @@ default: &default
 
 development:
   <<: *default
-  database: mastodon_development
+  database: <%= ENV['DB_NAME'] || 'mastodon_development' %>
   username: <%= ENV['DB_USER'] %>
   password: <%= ENV['DB_PASS'] %>
   host: <%= ENV['DB_HOST'] %>
@@ -17,7 +17,7 @@ development:
 # Do not set this db to the same as development or production.
 test:
   <<: *default
-  database: mastodon_test<%= ENV['TEST_ENV_NUMBER'] %>
+  database: <%= ENV['DB_NAME'] || 'mastodon' %>_test<%= ENV['TEST_ENV_NUMBER'] %>
   username: <%= ENV['DB_USER'] %>
   password: <%= ENV['DB_PASS'] %>
   host: <%= ENV['DB_HOST'] %>
diff --git a/streaming/index.js b/streaming/index.js
index 017073fa1..83903b89b 100644
--- a/streaming/index.js
+++ b/streaming/index.js
@@ -80,7 +80,7 @@ const startWorker = (workerId) => {
     development: {
       user:     process.env.DB_USER || pg.defaults.user,
       password: process.env.DB_PASS || pg.defaults.password,
-      database: 'mastodon_development',
+      database: process.env.DB_NAME || 'mastodon_development',
       host:     process.env.DB_HOST || pg.defaults.host,
       port:     process.env.DB_PORT || pg.defaults.port,
       max:      10,