diff --git a/NEWS b/NEWS
index acc5dcaa..35b09fd1 100644
--- a/NEWS
+++ b/NEWS
@@ -26,6 +26,7 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
   the other involving an undefined $is_folder error.
 - Throw error when %Core.Encoding is set to a spurious value. Previously,
   this errored silently and returned false.
+- Redirected stderr to stdout for flush error output.
 . Strategy_MakeWellFormed now operates in-place, saving memory and allowing
   for more interesting filter-backtracking
 . New HTMLPurifier_Injector->rewind() functionality, allows injectors to rewind
diff --git a/tests/common.php b/tests/common.php
index 60ff87cd..1e6890d4 100644
--- a/tests/common.php
+++ b/tests/common.php
@@ -201,7 +201,7 @@ class FailedTest extends UnitTestCase {
  * Flushes all caches, and fatally errors out if there's a problem.
  */
 function htmlpurifier_flush($php, $reporter) {
-    exec($php . ' ../maintenance/flush.php ' . $php, $out, $status);
+    exec($php . ' ../maintenance/flush.php ' . $php . ' 2>&1', $out, $status);
     if ($status) {
         $test = new FailedTest(
             'maintenance/flush.php returned non-zero exit status',