diff --git a/search2/search/expr.inc.php b/search2/search/expr.inc.php
index 16f57be..4d6a6f8 100755
--- a/search2/search/expr.inc.php
+++ b/search2/search/expr.inc.php
@@ -1646,6 +1646,10 @@ class OpExpr extends Expr
 
         if (is_null($this->parent))
         {
+        	if ($this->not())
+        	{
+            	 $expr = "NOT $expr";
+        	}
             return $expr;
         }