diff --git a/Dockerfile b/Dockerfile
index cec81c5..c4af265 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -82,9 +82,9 @@
 
 RUN mkdir /kalamar/data
 
-ENV MOJO_PORT   64543
-ENV MOJO_LISTEN http://*:${MOJO_PORT}
-ENV MOJO_MODE   production
+ENV MOJO_PORT=64543
+ENV MOJO_LISTEN=http://*:${MOJO_PORT}
+ENV MOJO_MODE=production
 
 RUN echo "{Kalamar=>{plugins=>['KorAPXML2Krill','Tei2KorAPXML','KorAPXML2CoNLLU','Plugins'],proxies=>['PROXY_STUB']},'Kalamar-Plugins'=>{default=>['PLUGIN_STUB']}}" > kalamar.production.conf