diff --git a/src/PHPSQLParser/processors/ExpressionListProcessor.php b/src/PHPSQLParser/processors/ExpressionListProcessor.php
index f8d72cf7..d92e4b63 100644
--- a/src/PHPSQLParser/processors/ExpressionListProcessor.php
+++ b/src/PHPSQLParser/processors/ExpressionListProcessor.php
@@ -315,6 +315,8 @@ public function process($tokens) {
                     break;
 
                 case 'NULL':
+                case 'TRUE':
+                case 'FALSE':
                     $curr->setSubTree(false);
                     $curr->setTokenType(ExpressionType::CONSTANT);
                     break;