diff --git a/src/Symfony/Component/Process/ProcessPipes.php b/src/Symfony/Component/Process/ProcessPipes.php
index c35d7bc96b..67b11e615b 100644
--- a/src/Symfony/Component/Process/ProcessPipes.php
+++ b/src/Symfony/Component/Process/ProcessPipes.php
@@ -289,9 +289,13 @@ class ProcessPipes
 
         foreach ($r as $pipe) {
             $type = array_search($pipe, $this->pipes);
-            $data = fread($pipe, 8192);
 
-            if (strlen($data) > 0) {
+            $data = '';
+            while ($dataread = fread($pipe, 8192)) {
+                $data .= $dataread;
+            }
+
+            if ($data) {
                 $read[$type] = $data;
             }
 
diff --git a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
index b5b34b2197..6401ec33e4 100644
--- a/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/AbstractProcessTest.php
@@ -80,6 +80,32 @@ abstract class AbstractProcessTest extends \PHPUnit_Framework_TestCase
         $this->assertLessThan(1.8, $duration);
     }
 
+    public function testAllOutputIsActuallyReadOnTermination()
+    {
+        // this code will result in a maximum of 2 reads of 8192 bytes by calling
+        // start() and isRunning().  by the time getOutput() is called the process
+        // has terminated so the internal pipes array is already empty. normally
+        // the call to start() will not read any data as the process will not have
+        // generated output, but this is non-deterministic so we must count it as
+        // a possibility.  therefore we need 2 * 8192 plus another byte which will
+        // never be read.
+        $expectedOutputSize = 16385;
+
+        $code = sprintf('echo str_repeat(\'*\', %d);', $expectedOutputSize);
+        $p = $this->getProcess(sprintf('php -r %s', escapeshellarg($code)));
+
+        $p->start();
+        usleep(250000);
+
+        if ($p->isRunning()) {
+            $this->fail('Process execution did not complete in the required time frame');
+        }
+
+        $o = $p->getOutput();
+
+        $this->assertEquals($expectedOutputSize, strlen($o));
+    }
+
     public function testCallbacksAreExecutedWithStart()
     {
         $data = '';