diff --git a/library/HTMLPurifier/AttrDef/CSS.php b/library/HTMLPurifier/AttrDef/CSS.php
index 9a0f60ff..2ac18993 100644
--- a/library/HTMLPurifier/AttrDef/CSS.php
+++ b/library/HTMLPurifier/AttrDef/CSS.php
@@ -14,7 +14,7 @@ class HTMLPurifier_AttrDef_CSS
         // This is because semicolon rarely appears in escaped form
         
         $declarations = explode(';', $css);
-        $new_declarations = '';
+        $propvalues = array();
         
         foreach ($declarations as $declaration) {
             if (!$declaration) continue;
@@ -23,7 +23,12 @@ class HTMLPurifier_AttrDef_CSS
             if (!isset($definition->info[$property])) continue;
             $result = $definition->info[$property]->validate($value,$config,$context);
             if ($result === false) continue;
-            $new_declarations .= "$property:$result;";
+            $propvalues[$property] = $result;
+        }
+        
+        $new_declarations = '';
+        foreach ($propvalues as $prop => $value) {
+            $new_declarations .= "$prop:$value;";
         }
         
         return $new_declarations ? $new_declarations : false;
diff --git a/tests/HTMLPurifier/AttrDef/CSSTest.php b/tests/HTMLPurifier/AttrDef/CSSTest.php
index 58272a3b..ae1694d9 100644
--- a/tests/HTMLPurifier/AttrDef/CSSTest.php
+++ b/tests/HTMLPurifier/AttrDef/CSSTest.php
@@ -10,6 +10,7 @@ class HTMLPurifier_AttrDef_CSSTest extends HTMLPurifier_AttrDefHarness
         $this->def = new HTMLPurifier_AttrDef_CSS();
         
         $this->assertDef('text-align:right;');
+        $this->assertDef('text-align:right;text-align:left;', 'text-align:left;');
         
     }