diff --git a/.travis.yml b/.travis.yml
index 1d26b51..b841f4e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,5 +32,6 @@ install:
 #  - pear upgrade --force --alldeps pear/pear
   - pear install -f package.xml
 script:
+  - pear version
   - pear run-tests -qr tests/
   - for i in `find tests/ -name '*.out'`; do echo "$i"; cat "$i"; done
diff --git a/Archive/Tar.php b/Archive/Tar.php
index 53966c2..3ef278a 100644
--- a/Archive/Tar.php
+++ b/Archive/Tar.php
@@ -1692,7 +1692,16 @@ public function _readHeader($v_binary_data, &$v_header)
         }
 
         // ----- Extract the checksum
-        $v_header['checksum'] = OctDec(trim($v_data['checksum']));
+        $v_data_checksum = trim($v_data['checksum']);
+        if (!preg_match('/^[0-7]*$/', $v_data_checksum)) {
+            $this->_error(
+                'Invalid checksum for file "' . $v_data['filename']
+                . '" : ' . $v_data_checksum . ' extracted'
+            );
+            return false;
+        }
+
+        $v_header['checksum'] = OctDec($v_data_checksum);
         if ($v_header['checksum'] != $v_checksum) {
             $v_header['filename'] = '';
 
diff --git a/tests/invalidchecksum.phpt b/tests/invalidchecksum.phpt
index 55f4ed4..c70cee7 100644
--- a/tests/invalidchecksum.phpt
+++ b/tests/invalidchecksum.phpt
@@ -12,7 +12,7 @@ $phpunit->assertErrors(array(
     array('package' => 'PEAR_Error', 'message' => "Invalid checksum for file \"4&2Vib~Au.=ZqMTw~=}UoF/~5Gs;JTXF*<FyG\"\n" .
                                                                                '1Hvu#nol Y 21/{G9i|D=$GTI KREuA\wI<wM@dYOKzS{6&]QE8ud|EPb:f?-Gt' . "\n" .
                                                                                'I#)E9)@;_.0y9`P,&jY! :\.J8uG/a8,.vT[$Fe;>}hm\"#xO7:46y_tg6c-[A&S]z0fke?(B6?$:W$X{E%PO>~UWl8(' . "\n" .
-                                                                               '.%RWPjN55)cd&?oJPgFFZj#+U<qrF:9yIRe\" : 39049 calculated, 5 expected')), 'after 1');
+                                                                               '.%RWPjN55)cd&?oJPgFFZj#+U<qrF:9yIRe\" : UPJX05Zz extracted')), 'after 1');
 echo 'tests done';
 ?>
 --CLEAN--
diff --git a/tests/phpt_test.php.inc b/tests/phpt_test.php.inc
index 67222e8..8153dd6 100644
--- a/tests/phpt_test.php.inc
+++ b/tests/phpt_test.php.inc
@@ -8,7 +8,7 @@ class PEAR_PHPTest
 {
     var $_diffonly;
     var $_errors;
-    function PEAR_PHPTest($diffonly = false, $noStackCatch = false)
+    function __construct($diffonly = false, $noStackCatch = false)
     {
         $this->_diffonly = $diffonly;
         $this->_errors = array();
diff --git a/tests/setup.php.inc b/tests/setup.php.inc
index b2415a9..0c7759b 100644
--- a/tests/setup.php.inc
+++ b/tests/setup.php.inc
@@ -1,4 +1,5 @@
 <?php
+error_reporting(E_ALL);
 require_once dirname(__FILE__) . '/phpt_test.php.inc';
 $phpunit = new PEAR_PHPTest(true);
 require_once dirname(dirname(__FILE__)) . '/Archive/Tar.php';