diff --git a/docker-compose.yml b/docker-compose.yml
index 47748d5..939e0a9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,3 @@
-version: '3.8'
 
 services:
   redis:
diff --git a/start_services.sh b/start_services.sh
index af9f354..f0cf5a8 100755
--- a/start_services.sh
+++ b/start_services.sh
@@ -20,7 +20,7 @@ max_size_bytes=$((2 * 1024 * 1024 * 1024 * 10))
 
 echo "Mounting $WORK_DIR ($dir_size_bytes bytes) to docker."
 
-if [ "$dir_size_bytes" -gt "$max_size_bytes" ]; then
+if [ -n "$dir_size_bytes" ] && [ "$dir_size_bytes" -gt "$max_size_bytes" ]; then
     echo "Error: WORK_DIR ($WORK_DIR) contains more than 20GB of data ($(du -sh "$WORK_DIR" 2>/dev/null | awk '{print $1}'))."
     exit 1
 fi