diff --git a/index.php b/index.php
index fb167d3..4c099b7 100644
--- a/index.php
+++ b/index.php
@@ -599,7 +599,7 @@ $linkUrl = !$hasSupplier ? generateUrl() : (!$hasEvent ? generateUrl($supplier)
 									<div class="col-sm-10">
 										<div class="btn-group" role="group">
 											<?php foreach ($config[$supplier]['choices'] as $index => $choice) : ?>
-											<input type="radio" class="btn-check" id="<?php printf('option%d', $index); ?>" autocomplete="off" name="choice" value="<?php echo $choice; ?>" />
+											<input type="radio" class="btn-check" id="<?php printf('option%d', $index); ?>" autocomplete="off" name="choice" value="<?php echo $choice; ?>" required />
 											<label class="btn btn-outline-light" for="<?php printf('option%d', $index); ?>"><?php echo $choice; ?></label>
 											<?php endforeach; ?>
 										</div>