From 1a908b30a47fb3d304dd66232263ad27d099d72f Mon Sep 17 00:00:00 2001
From: Daniel Bachhuber <daniel.bachhuber@automattic.com>
Date: Wed, 12 Apr 2023 15:56:34 -0700
Subject: [PATCH] Use POSIX-compatible counter incrementing

---
 bin/install-package-tests | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/install-package-tests b/bin/install-package-tests
index c1cf6a273..783233981 100755
--- a/bin/install-package-tests
+++ b/bin/install-package-tests
@@ -52,7 +52,7 @@ while ! mysql --user="${USER}" "${PASSWORD_STRING}" --execute="SHOW DATABASES;"
 do
   echo 'Waiting for MySQL...'
   sleep 5
-  let "i+=1"
+  i=$((i+1))
   if [ $i -gt 36 ]; then
 	echo 'MySQL failed to start. Aborting.'
 	exit 1