diff --git a/SqlBuilder.php b/SqlBuilder.php
index 02786a6..188c6f2 100644
--- a/SqlBuilder.php
+++ b/SqlBuilder.php
@@ -190,10 +190,7 @@ class SqlBuilder extends Component
         if (is_null($value)) {
             return $keys;
         }
-        if (is_numeric($key)) {
-            $this->query->pushParam($value);
-            $keys[] = $key . '= ?';
-        } else if (preg_match('/^[+|-]\s\d+$/', $value)) {
+        if (preg_match('/^[+|-]\s\d+$/', (string)$value)) {
             $keys[] = $key . '=' . $key . ' ' . $value;
         } else {
             $this->query->pushParam($value);