diff --git a/stackrc b/stackrc
index 9630221f4e..196f61fa3c 100644
--- a/stackrc
+++ b/stackrc
@@ -758,8 +758,8 @@ for image_url in ${IMAGE_URLS//,/ }; do
     fi
 done
 
-# 24Gb default volume backing file size
-VOLUME_BACKING_FILE_SIZE=${VOLUME_BACKING_FILE_SIZE:-24G}
+# 30Gb default volume backing file size
+VOLUME_BACKING_FILE_SIZE=${VOLUME_BACKING_FILE_SIZE:-30G}
 
 # Prefixes for volume and instance names
 VOLUME_NAME_PREFIX=${VOLUME_NAME_PREFIX:-volume-}