diff --git a/uc_product/uc_product.module b/uc_product/uc_product.module
index 3650aad..ff55b65 100644
--- a/uc_product/uc_product.module
+++ b/uc_product/uc_product.module
@@ -1312,7 +1312,7 @@ function uc_product_type_names() {
  */
 function uc_product_is_product($node) {
   // Load the node object if we received an integer as an argument.
-  if (is_int($node)) {
+  if (is_numeric($node)) {
     $node = node_load($node);
   }