diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index f95b34a312673..7042072deb7aa 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -558,6 +558,7 @@ public function getIterator($flags = 0)
             }
 
             $this->readPipesForOutput(__FUNCTION__, $blocking);
+            $this->checkTimeout();
         }
     }
 
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index cd57f3a8c32df..f317fc7d72938 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -747,6 +747,27 @@ public function testRunProcessWithTimeout()
         throw $e;
     }
 
+    /**
+     * @expectedException \Symfony\Component\Process\Exception\ProcessTimedOutException
+     * @expectedExceptionMessage exceeded the timeout of 0.1 seconds.
+     */
+    public function testIterateOverProcessWithTimeout()
+    {
+        $process = $this->getProcess(self::$phpBin.' -r "sleep(30);"');
+        $process->setTimeout(0.1);
+        $start = microtime(true);
+        try {
+            $process->start();
+            foreach ($process as $buffer);
+            $this->fail('A RuntimeException should have been raised');
+        } catch (RuntimeException $e) {
+        }
+
+        $this->assertLessThan(15, microtime(true) - $start);
+
+        throw $e;
+    }
+
     public function testCheckTimeoutOnNonStartedProcess()
     {
         $process = $this->getProcess('echo foo');