diff --git a/docker/docker-compose.test.yml b/docker/docker-compose.test.yml
index 5ff2b70c..13596eea 100644
--- a/docker/docker-compose.test.yml
+++ b/docker/docker-compose.test.yml
@@ -1,4 +1,4 @@
 services:
   sut:
-    build: .
+    image: matpower/matpower:${DOCKER_TAG}
     command: matpower_docker_tests.sh