diff --git a/user.html b/user.html
index cc4f049..ce63fc5 100644
--- a/user.html
+++ b/user.html
@@ -74,7 +74,7 @@
 
     <div class="flex biceps">
         <div>
-            <input type="number" id="sellvalue" value = "1" >
+            <input type="number" id="sellvalue" value = "1" min="0">
             <input type="button" id="sell" value="Sell">
         </div>
     </div>