diff --git a/add_material_form.php b/add_material_form.php
index 5c0c8c2..c8f05ad 100644
--- a/add_material_form.php
+++ b/add_material_form.php
@@ -91,7 +91,7 @@
         </div>
         <div class="form-group">
             <label for="expiration_date">Mindesthaltbarkeitsdatum:</label>
-            <input type="date" id="expiration_date" name="expiration_date" required>
+            <input type="date" id="expiration_date" name="expiration_date">
         </div>
         <div class="form-group">
             <label for="barcode">Barcode/EAN:</label>