diff --git a/library/Zend/Filter/Compress/Tar.php b/library/Zend/Filter/Compress/Tar.php
index 16ca08e2e65..f8a3d3129c2 100644
--- a/library/Zend/Filter/Compress/Tar.php
+++ b/library/Zend/Filter/Compress/Tar.php
@@ -126,16 +126,16 @@ public function getMode()
      */
     public function setMode($mode)
     {
-        $mode = ucfirst(strtolower($mode));
-        if (($mode != 'Bz2') && ($mode != 'Gz')) {
+        $mode = strtolower($mode);
+        if (($mode != 'bz2') && ($mode != 'gz')) {
             throw new Exception\InvalidArgumentException("The mode '$mode' is unknown");
         }
 
-        if (($mode == 'Bz2') && (!extension_loaded('bz2'))) {
+        if (($mode == 'bz2') && (!extension_loaded('bz2'))) {
             throw new Exception\ExtensionNotLoadedException('This mode needs the bz2 extension');
         }
 
-        if (($mode == 'Gz') && (!extension_loaded('zlib'))) {
+        if (($mode == 'gz') && (!extension_loaded('zlib'))) {
             throw new Exception\ExtensionNotLoadedException('This mode needs the zlib extension');
         }
 
diff --git a/tests/ZendTest/Filter/Compress/TarTest.php b/tests/ZendTest/Filter/Compress/TarTest.php
index f14b76b9427..c9f0b373531 100644
--- a/tests/ZendTest/Filter/Compress/TarTest.php
+++ b/tests/ZendTest/Filter/Compress/TarTest.php
@@ -70,7 +70,9 @@ public function tearDown()
             dirname(__DIR__) . '/_files/_compress/Compress',
             dirname(__DIR__) . '/_files/_compress/zipextracted.txt',
             dirname(__DIR__) . '/_files/_compress',
-            dirname(__DIR__) . '/_files/compressed.tar'
+            dirname(__DIR__) . '/_files/compressed.tar',
+            dirname(__DIR__) . '/_files/compressed.tar.gz',
+            dirname(__DIR__) . '/_files/compressed.tar.bz2'
         );
 
         foreach ($files as $file) {
@@ -215,6 +217,20 @@ public function testTarCompressDirectory()
                             . DIRECTORY_SEPARATOR . 'compressed.tar', $content);
     }
 
+    public function testSetModeShouldWorkWithCaseInsensitive()
+    {
+        $filter = new TarCompression;
+        $filter->setTarget(dirname(__DIR__).'/_files/zipextracted.txt');
+
+        foreach(array('GZ', 'Bz2') as $mode) {
+            $archive = dirname(__DIR__).'/_files/compressed.tar.'.strtolower($mode);
+            $filter->setArchive($archive);
+            $filter->setMode($mode);
+            $content = $filter->compress('compress me');
+            $this->assertEquals($archive, $content);   
+        }
+    }
+
     /**
      * testing toString
      *