From 44e452fb3c8cc7a093d72fbc280be3973e627a62 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Fri, 19 Apr 2019 21:26:04 -0400
Subject: Add braces to param exps in arith substs

---
(limited to 'src/mutex.sh')

diff --git a/src/mutex.sh b/src/mutex.sh
index fe74760..60ab07d 100644
--- a/src/mutex.sh
+++ b/src/mutex.sh
@@ -34,7 +34,7 @@ mutex_timedlock()
 
 	while ! mutex_trylock "${mutex}"; do
 		[ ${timeout} -eq 0 ] && return 1
-		timeout=$(($timeout - 1))
+		timeout=$((${timeout} - 1))
 		sleep 1
 	done
 
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