diff --git a/modules/cart/commerce_cart.module b/modules/cart/commerce_cart.module
index 8274e3d..3191a9d 100644
--- a/modules/cart/commerce_cart.module
+++ b/modules/cart/commerce_cart.module
@@ -1351,12 +1351,22 @@ function commerce_cart_field_instance_access_settings($instance) {
 function commerce_cart_add_to_cart_form_id($product_ids, $qty = 0) {
   // Make sure the length of the form id is limited.
   $data = implode('_', $product_ids);
+  static $commerce_cart_add_to_cart_form_ids;
 
   if (strlen($data) > 50) {
     $data = drupal_hash_base64($data);
   }
+  $form_id = 'commerce_cart_add_to_cart_form_' . $data;
+  // make sure the form_id is unique, adds an extra incremental number to the id
+  if (isset($commerce_cart_add_to_cart_form_ids[$form_id])) {
+    $commerce_cart_add_to_cart_form_ids[$form_id] += 1;
+  }
+  else {
+    $commerce_cart_add_to_cart_form_ids[$form_id] = 1;
+  }
+  $form_id .= '_' . $commerce_cart_add_to_cart_form_ids[$form_id];
 
-  return 'commerce_cart_add_to_cart_form_' . $data;
+  return $form_id;
 }
 
 /**