diff --git a/www/includes/easyparliament/helper-donate.php b/www/includes/easyparliament/helper-donate.php
index d930cc6e54..069b325eeb 100644
--- a/www/includes/easyparliament/helper-donate.php
+++ b/www/includes/easyparliament/helper-donate.php
@@ -78,7 +78,7 @@ function stripe_session_ajax($successPage, $cancelPage)
         $howoften = "monthly";
     }
     $validPeriods = ["monthly" => "month", "annually" => "year"];
-    $period = $validPeriods[$howoften] ?? "once";
+    $period = $validPeriods[$howoften] ?? "one-off";
 
     $metadata = [
         "gift-aid" => $giftaid,
@@ -112,7 +112,7 @@ function stripe_session_ajax($successPage, $cancelPage)
     We run services such as TheyWorkForYou, WhatDoTheyKnow and FixMyStreet.
     ";
 
-    if ($period == "once") {
+    if ($period == "one-off") {
         // one off payments
         $data += [
             "mode" => "payment",
diff --git a/www/includes/easyparliament/templates/html/donate/_stripe_donate.php b/www/includes/easyparliament/templates/html/donate/_stripe_donate.php
index dfed65848d..21873a01fe 100644
--- a/www/includes/easyparliament/templates/html/donate/_stripe_donate.php
+++ b/www/includes/easyparliament/templates/html/donate/_stripe_donate.php
@@ -61,7 +61,7 @@
     <h2>Donate to TheyWorkForYou and mySociety</h3>
 
     <div class="fat-radio-buttons">
-        <label for="how-often-once" class="inline-radio-label"><input type="radio" id="how-often-once" name="how-often" value="once" data-default-amount="<?= $default_amounts["one-off"] ?>" required <?php get_checked($initial_payment_type, 'one-off') ?>>One-off donation</label>
+        <label for="how-often-one-off" class="inline-radio-label"><input type="radio" id="how-often-one-off" name="how-often" value="one-off" data-default-amount="<?= $default_amounts["one-off"] ?>" required <?php get_checked($initial_payment_type, 'one-off') ?>>One-off donation</label>
         <label for="how-often-annually" class="inline-radio-label"><input type="radio" id="how-often-annually" name="how-often" value="annually" data-default-amount="<?= $default_amounts["annually"] ?>" required <?php get_checked($initial_payment_type, 'annually') ?>>Annual donation</label>
         <label for="how-often-monthly" class="inline-radio-label"><input type="radio" id="how-often-monthly" name="how-often" value="monthly" data-default-amount="<?= $default_amounts["monthly"] ?>" required <?php get_checked($initial_payment_type, 'monthly') ?>>Monthly donation</label>
     </div>