diff --git a/wud/docker-compose.yml b/wud/docker-compose.yml
index 78d2b25..63affdd 100644
--- a/wud/docker-compose.yml
+++ b/wud/docker-compose.yml
@@ -1,6 +1,6 @@
 services:
   whatsupdocker:
-    image: {DOCKER_REGISTRY:-}getwud/wud
+    image: ${DOCKER_REGISTRY:-}getwud/wud
     container_name: wud
     env_file:
       - stack.env