diff --git a/docker/.env b/docker/.env
index da56990..f18f7be 100644
--- a/docker/.env
+++ b/docker/.env
@@ -5,6 +5,9 @@
 # also has an inline default in docker-compose.yml, so this file just pins the
 # versions the project builds and tests against.
 
+# Docker Compose project name (prevents collision with other compose projects)
+COMPOSE_PROJECT_NAME=rocoto
+
 # Ubuntu base version. Selects which published image variant we pull from the
 # dockerslurmcluster registry (must match a published image tag).
 # Currently supported values: '26.04' or '24.04'