diff --git a/Dockerfile b/Dockerfile
index acaf616..3b7ca67 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,9 +18,4 @@ RUN \
 
 COPY . .
 
-# Set required variables for GR.rb
-#  see https://github.com/red-data-tools/GR.rb
-ENV GRDIR="/usr/gr"
-ENV GKS_WSTYPE=100
-
 CMD ["/bin/bash -c ruby ./smartmeter.rb"]