diff --git a/activerecord/test/cases/fixtures_test.rb b/activerecord/test/cases/fixtures_test.rb
index b07d4f3521e30f792e905cd9ef8b0c22c7e59767..eb3f03c91d48c39f2abf69cc3645d8101c13b951 100644
--- a/activerecord/test/cases/fixtures_test.rb
+++ b/activerecord/test/cases/fixtures_test.rb
@@ -185,7 +185,7 @@ def test_subsubdir_file_with_arbitrary_name
 
   def test_binary_in_fixtures
     assert_equal 1, @binaries.size
-    data = File.read(ASSETS_ROOT + "/flowers.jpg")
+    data = File.open(ASSETS_ROOT + "/flowers.jpg", 'rb') { |f| f.read }
     data.force_encoding('ASCII-8BIT') if data.respond_to?(:force_encoding)
     data.freeze
     assert_equal data, @flowers.data