diff --git a/tests/feeds_mapper_file.test b/tests/feeds_mapper_file.test
index 9adfc4b..a3bfc1d 100644
--- a/tests/feeds_mapper_file.test
+++ b/tests/feeds_mapper_file.test
@@ -279,9 +279,9 @@ class FeedsMapperFileTestCase extends FeedsMapperTestCase {
     // Assert files exist.
     $files = $this->listTestFiles();
     foreach ($files as $file) {
-      $file_uri = 'public://' . rawurlencode($file);
-      $this->assertTrue(file_exists($file_uri), format_string('The file %file exists.', array(
-        '%file' => $file_uri,
+      $file_path = drupal_realpath('public://') . '/' . rawurlencode($file);
+      $this->assertTrue(file_exists($file_path), format_string('The file %file exists.', array(
+        '%file' => $file_path,
       )));
     }
 
@@ -326,9 +326,9 @@ class FeedsMapperFileTestCase extends FeedsMapperTestCase {
     // Assert files are removed.
     $files = $this->listTestFiles();
     foreach ($files as $file) {
-      $file_uri = 'public://' . rawurlencode($file);
-      $this->assertFalse(file_exists($file_uri), format_string('The file %file no longer exists.', array(
-        '%file' => $file_uri,
+      $file_path = drupal_realpath('public://') . '/' . rawurlencode($file);
+      $this->assertFalse(file_exists($file_path), format_string('The file %file no longer exists.', array(
+        '%file' => $file_path,
       )));
     }
     // Check if the files are removed from the node edit form as well.