diff --git a/checkout.html b/checkout.html
index 63542b7..3e23903 100644
--- a/checkout.html
+++ b/checkout.html
@@ -74,7 +74,12 @@
 
 						<div class="form-group">
 							<label for="post_code">Postal Code <span>*</span></label>
-							<input type="text" id="post_code" name="post_code" required />
+							<input
+								type="text"
+								id="post_code"
+								name="post_code"
+								maxlength="6"
+								required />
 						</div>
 
 						<button