diff --git a/src/Quoter.php b/src/Quoter.php
index d745098..b24e187 100644
--- a/src/Quoter.php
+++ b/src/Quoter.php
@@ -223,7 +223,7 @@ protected function replaceNamesAndAliasIn($val)
     {
         $quoted = $this->replaceNamesIn($val);
         $pos = strripos($quoted, ' AS ');
-        if ($pos) {
+        if ($pos !== false) {
             $alias = $this->replaceName(substr($quoted, $pos + 4));
             $quoted = substr($quoted, 0, $pos) . " AS $alias";
         }