diff --git a/Dockerfile b/Dockerfile
index a8798a9e6c..dce3f6d015 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -93,6 +93,8 @@ ENV WEB_API_USER "sharelatex"
 
 ENV SHARELATEX_APP_NAME "Overleaf Community Edition"
 
+ENV OPTIMISE_PDF "true"
+
 
 EXPOSE 80
 
diff --git a/settings.coffee b/settings.coffee
index 9912fd1ea6..ef2fdd4115 100644
--- a/settings.coffee
+++ b/settings.coffee
@@ -22,6 +22,9 @@ TMP_DIR = '/var/lib/sharelatex/tmp'
 
 settings =
 
+	clsi:
+		optimiseInDocker: process.env['OPTIMISE_PDF'] == 'true'
+
 	brandPrefix: ""
 
 	allowAnonymousReadAndWriteSharing: