diff --git a/UnitTests/Compiler/Delimiter/DelimiterTest.php b/UnitTests/Compiler/Delimiter/DelimiterTest.php
index 3bddff1..11e333e 100644
--- a/UnitTests/Compiler/Delimiter/DelimiterTest.php
+++ b/UnitTests/Compiler/Delimiter/DelimiterTest.php
@@ -89,4 +89,14 @@ public function testDelimiter5()
         $tpl = $this->smarty->createTemplate('eval:{=assign var=foo value="hello world" nocache=}{=$foo=}');
         $this->assertEquals("hello world", $this->smarty->fetch($tpl));
     }
+    /**
+     * test {= =} delimiter for conficts with option flags
+     */
+    public function testDelimiterIssue450()
+    {
+        $this->smarty->left_delimiter = '{^';
+        $this->smarty->right_delimiter = '^}';
+        $tpl = $this->smarty->createTemplate('eval:{^assign var=foo value="hello world" nocache^}{^$foo^}');
+        $this->assertEquals("hello world", $this->smarty->fetch($tpl));
+    }
 }