1 files changed, 3 insertions, 2 deletions

diff --git a/partitions/Makefile b/partitions/Makefile
index 4a00333..20e9afe 100644
--- a/partitions/Makefile
+++ b/partitions/Makefile
@@ -9,11 +9,12 @@ whole.img:
 key.img:
         partvi key
 
+PERSIST_SIZE=20G
 persist.img:
         [ ! -e $@ ]
-        fallocate -l 20G $@
+        fallocate -l "$(PERSIST_SIZE)" $@
         truncate -s 0 $@
-        truncate -s 20G $@
+        truncate -s "$(PERSIST_SIZE)" $@
 
 persist := $(shell [ -e persist.img ] && printf %s '-drive file=persist.img,media=disk,driver=raw' || true)