diff --git a/run/disk.sh b/run/disk.sh
index 8257eee..b4b385d 100644
--- a/run/disk.sh
+++ b/run/disk.sh
@@ -50,7 +50,7 @@ if [ -f "${DATA}" ]; then
         GB=$(( (REQ + 1073741823)/1073741824 ))
         echo "INFO: Writing ${GB} GB of zeroes, please wait.."
 
-        dd if=/dev/zero of="${DATA}" seek="{OLD_SIZE}" count="${REQ}" bs=1M iflag=count_bytes oflag=seek_bytes
+        dd if=/dev/zero of="${DATA}" seek="${OLD_SIZE}" count="${REQ}" bs=1M iflag=count_bytes oflag=seek_bytes
 
       else