diff --git a/rootfs/etc/confd/templates/config.yaml.tmpl b/rootfs/etc/confd/templates/config.yaml.tmpl
index 148d340..fb824ec 100644
--- a/rootfs/etc/confd/templates/config.yaml.tmpl
+++ b/rootfs/etc/confd/templates/config.yaml.tmpl
@@ -20,7 +20,7 @@ appservice:
     # The database type. Only "sqlite3" is supported.
     type: postgres
     # The database URI. Usually file name. https://github.com/mattn/go-sqlite3#connection-string
-    uri: {{ DATABASE_DATASOURCE }}
+    uri: {{ getenv "DATABASE_DATASOURCE" }}
   # Path to the Matrix room state store.
   state_store_path: /var/lib/matrix-bridge/data/mx-state.json