diff --git a/config/server.sh b/config/server.sh
index 73fe1dcd1..fd15d22dc 100644
--- a/config/server.sh
+++ b/config/server.sh
@@ -4,9 +4,10 @@
 THIN_PORT=3000
 SOCKET_PORT=8080
 
-# See thin -h for possible values.
-DEFAULT_THIN_ARGS="-p $THIN_PORT"
+# Choose one mode by uncommenting
+export RAILS_ENV='development'
+#export RAILS_ENV='production'
+#export RAILS_ENV='test'
 
-# Uncomment to run in production/test mode.
-# DEFAULT_THIN_ARGs="$DEFAULT_THIN_ARGS -e production"
-# DEFAULT_THIN_ARGs="$DEFAULT_THIN_ARGS -e test"
+# See thin -h for possible values.
+DEFAULT_THIN_ARGS="-p $THIN_PORT -e $RAILS_ENV"