diff --git a/src/scripts/entrypoint.sh b/src/scripts/entrypoint.sh
index 1235b54..3317d39 100644
--- a/src/scripts/entrypoint.sh
+++ b/src/scripts/entrypoint.sh
@@ -27,7 +27,7 @@ last_renewal_file="/etc/letsencrypt/last_renewal.txt"
 
 # Instead of trying to run `cron` or something like that, just sleep and run `certbot`.
 while [ true ]; do
-    if [ is_renewal_required $last_renewal_file ]; then
+    if is_renewal_required $last_renewal_file; then
         # Recreate the file to persist the last renewal timestamp
         touch "$last_renewal_file"
 
diff --git a/src/scripts/util.sh b/src/scripts/util.sh
index 693107d..d03a0d2 100644
--- a/src/scripts/util.sh
+++ b/src/scripts/util.sh
@@ -80,9 +80,7 @@ get_certificate() {
 # required (last renewal ran over a week ago), return false otherwise
 is_renewal_required() {
     # If the file does not exist assume a renewal is required
-    if [ ! -e "$1" ]; then
-        return true
-    fi
+    [[ ! -e "$1" ]] && return;
     
     # If the file exists, check if the last renewal was more than a week ago
     one_week_sec=604800
@@ -90,5 +88,5 @@ is_renewal_required() {
     last_renewal_sec=$(stat -c %Y "$1")
     last_renewal_delta_sec=$(( ($now_sec - $last_renewal_sec) ))
     is_finshed_week_sec=$(( ($one_week_sec - $last_renewal_delta_sec) ))
-    return $is_finshed_week_sec -lt 0
+    [[ $is_finshed_week_sec -lt 0 ]]
 }