diff --git a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
index 115f486f023f5..e217820950057 100644
--- a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
+++ b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
@@ -223,12 +223,17 @@ public function prepare(Request $request)
                     list($pathPrefix, $location) = $part;
                     if (substr($path, 0, \strlen($pathPrefix)) === $pathPrefix) {
                         $path = $location.substr($path, \strlen($pathPrefix));
+                        // Only set X-Accel-Redirect header if a valid URI can be produced
+                        // as nginx does not serve arbitrary file paths.
+                        $this->headers->set($type, $path);
+                        $this->maxlen = 0;
                         break;
                     }
                 }
+            } else {
+                $this->headers->set($type, $path);
+                $this->maxlen = 0;
             }
-            $this->headers->set($type, $path);
-            $this->maxlen = 0;
         } elseif ($request->headers->has('Range')) {
             // Process the range headers.
             if (!$request->headers->has('If-Range') || $this->hasValidIfRangeHeader($request->headers->get('If-Range'))) {
diff --git a/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
index 9f3beb08d1af3..effffe925be85 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
@@ -339,6 +339,7 @@ public function getSampleXAccelMappings()
             ['/var/www/var/www/files/foo.txt', '/var/www/=/files/', '/files/var/www/files/foo.txt'],
             ['/home/Foo/bar.txt', '/var/www/=/files/,/home/Foo/=/baz/', '/baz/bar.txt'],
             ['/home/Foo/bar.txt', '"/var/www/"="/files/", "/home/Foo/"="/baz/"', '/baz/bar.txt'],
+            ['/tmp/bar.txt', '"/var/www/"="/files/", "/home/Foo/"="/baz/"', null],
         ];
     }