diff --git a/agent/modals/expense/expense_add.php b/agent/modals/expense/expense_add.php
index 97b4a374..d623c126 100644
--- a/agent/modals/expense/expense_add.php
+++ b/agent/modals/expense/expense_add.php
@@ -34,7 +34,7 @@ ob_start();
                     <div class="input-group-prepend">
                         <span class="input-group-text"><i class="fa fa-fw fa-dollar-sign"></i></span>
                     </div>
-                    <input type="text" class="form-control" inputmode="decimal" pattern="[0-9]*\.?[0-9]{0,2}" name="amount" placeholder="0.00" required>
+                    <input type="text" class="form-control" inputmode="decimal" pattern="-?[0-9]*\.?[0-9]{0,2}" name="amount" placeholder="0.00" required>
                 </div>
             </div>
         </div>