diff --git a/install/alpine-step-ca-install.sh b/install/alpine-step-ca-install.sh
index cf89e827..93cb3a5f 100644
--- a/install/alpine-step-ca-install.sh
+++ b/install/alpine-step-ca-install.sh
@@ -75,7 +75,7 @@ while ! nc -z localhost 443; do
   sleep 0.5
   
   ((timeout_counter++))
-  if [[ $timeout_counter -gt 30 ]]; then
+  if (( timeout_counter > 30 )); then
     msg_error "Failed to start Step-CA"
     exit
   fi