diff --git a/trip_add_modal.php b/trip_add_modal.php
index e1fdac23..983977b1 100644
--- a/trip_add_modal.php
+++ b/trip_add_modal.php
@@ -8,6 +8,7 @@
                 </button>
             </div>
             <form action="post.php" method="post" autocomplete="off">
+                <input type="hidden" name="roundtrip" value="0">
                 <div class="modal-body bg-white">
 
                     <div class="form-row">
diff --git a/trip_edit_modal.php b/trip_edit_modal.php
index 72ef1d25..a4b33fd6 100644
--- a/trip_edit_modal.php
+++ b/trip_edit_modal.php
@@ -10,6 +10,7 @@
             <form action="post.php" method="post" autocomplete="off">
                 <div class="modal-body bg-white">
                     <input type="hidden" name="trip_id" value="<?php echo $trip_id; ?>">
+                    <input type="hidden" name="roundtrip" value="0">
 
                     <div class="form-row">