diff --git a/capsule/Dockerfile b/capsule/Dockerfile
index 79f43d3..4d92b1d 100644
--- a/capsule/Dockerfile
+++ b/capsule/Dockerfile
@@ -40,5 +40,5 @@ COPY content content
 RUN ./build_loglog.bash
 
 CMD \
-  ( sleep 5; comitium refresh --data comitium-data/ ) & \
+  ( ( sleep 5; comitium refresh --data comitium-data/ ) & ) \
   && agate --content content/ --addr [::]:1965 --addr 0.0.0.0:1965 --lang en-GB