diff --git a/roles/rproxy/tasks/dockerrepo.yml b/roles/rproxy/tasks/dockerrepo.yml
index b3b6151..6e3e5d9 100644
--- a/roles/rproxy/tasks/dockerrepo.yml
+++ b/roles/rproxy/tasks/dockerrepo.yml
@@ -87,9 +87,9 @@
         state: started
         ports:
             - "5000:5000"
-        environment:
-          - REGISTRY_HTTP_TLS_CERTIFICATE=/certs/dockerrepo.crt
-          - REGISTRY_HTTP_TLS_KEY=/certs/dockerrepo.key
+        env:
+          REGISTRY_HTTP_TLS_CERTIFICATE: "/certs/dockerrepo.crt"
+          REGISTRY_HTTP_TLS_KEY: "/certs/dockerrepo.key"
         volumes:
           - "{{ dockerrepo_data_dir }}:/var/lib/registry:z,rw"
           - "{{ dockerrepo_dir }}/certs:/certs:z,rw"