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-rw-r--r--src/block.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/block.sh b/src/block.sh
index f3fb8da..bb46e25 100644
--- a/src/block.sh
+++ b/src/block.sh
@@ -73,7 +73,7 @@ block_umount()
i=0
timed_out=false
while ! umount "${dir}"; do
- i=$(($i + 1))
+ i=$((${i} + 1))
if [ ${i} -eq 10 ]; then
timed_out=true
break