diff --git a/Dockerfile b/Dockerfile
index f29196c..95330e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,9 @@ ENV PATH /app/node_modules/.bin:$PATH
 # default location for angles api
 ENV REACT_APP_ANGLES_API_URL http://127.0.0.1:3000
 
+# otherwise you'll get an error.
+ENV GENERATE_SOURCEMAP false
+
 # default port to run on.
 ENV PORT 3001