diff --git a/tests/HTMLPurifier/AttrDef/CSSTest.php b/tests/HTMLPurifier/AttrDef/CSSTest.php
index cff811bc..37ec2d4c 100644
--- a/tests/HTMLPurifier/AttrDef/CSSTest.php
+++ b/tests/HTMLPurifier/AttrDef/CSSTest.php
@@ -127,7 +127,6 @@ class HTMLPurifier_AttrDef_CSSTest extends HTMLPurifier_AttrDefHarness
         $this->assertDef('scrollbar-highlight-color:#ff69b4;');
         $this->assertDef('scrollbar-shadow-color:#f0f;');
 
-        $this->assertDef('opacity:.2;');
         $this->assertDef('-moz-opacity:.2;');
         $this->assertDef('-khtml-opacity:.2;');
         $this->assertDef('filter:alpha(opacity=20);');
@@ -146,6 +145,7 @@ class HTMLPurifier_AttrDef_CSSTest extends HTMLPurifier_AttrDefHarness
         $this->assertDef('display:none;');
         $this->assertDef('visibility:visible;');
         $this->assertDef('overflow:scroll;');
+        $this->assertDef('opacity:.2;');
     }
 
     public function testForbidden()