diff --git a/Lib/test/test_import.py b/Lib/test/test_import.py
--- a/Lib/test/test_import.py
+++ b/Lib/test/test_import.py
@@ -126,6 +126,29 @@
                 remove_files(TESTFN)
                 unload(TESTFN)
 
+    @unittest.skipUnless(os.name == 'posix',
+                         "test meaningful only on posix systems")
+    def test_cached_mode_issue_2051(self):
+        mode = 0o600
+        source = TESTFN + ".py"
+        with script_helper.temp_dir() as tempdir:
+            path = script_helper.make_script(tempdir, TESTFN,
+                                             "key='top secret'")
+            os.chmod(path, mode)
+            compiled = imp.cache_from_source(path)
+            sys.path.insert(0, tempdir)
+            try:
+                __import__(TESTFN)
+            finally:
+                sys.path.remove(tempdir)
+
+            if not os.path.exists(compiled):
+                self.fail("__import__ did not result in creation of "
+                          "either a .pyc or .pyo file")
+            stat_info = os.stat(compiled)
+
+        self.assertEqual(stat.S_IMODE(stat_info.st_mode), mode)
+
     def test_imp_module(self):
         # Verify that the imp module can correctly load and find .py files
         # XXX (ncoghlan): It would be nice to use support.CleanImport