diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 6933b41353bd56..336ae447a8de5e 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -852,6 +852,9 @@ def check(tracebacklimit, expected):
         check(-1<<1000, [traceback[-1]])
         check(None, traceback)
 
+    def test_no_duplicates_in_meta_path(self):
+        self.assertEqual(len(sys.meta_path), len(set(sys.meta_path)))
+
 
 @test.support.cpython_only
 class SizeofTest(unittest.TestCase):
diff --git a/Misc/NEWS.d/next/Core and Builtins/2018-04-24-22-31-04.bpo-33128.g2yLuf.rst b/Misc/NEWS.d/next/Core and Builtins/2018-04-24-22-31-04.bpo-33128.g2yLuf.rst
new file mode 100644
index 00000000000000..66b98cdf51cfcf
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2018-04-24-22-31-04.bpo-33128.g2yLuf.rst	
@@ -0,0 +1,2 @@
+Fix a bug that causes PathFinder to appear twice on sys.meta_path. Patch by
+Pablo Galindo Salgado.
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index a9b9470c726521..958219b744580d 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -325,11 +325,6 @@ initimport(PyInterpreterState *interp, PyObject *sysmod)
 
     /* Install importlib as the implementation of import */
     value = PyObject_CallMethod(importlib, "_install", "OO", sysmod, impmod);
-    if (value != NULL) {
-        Py_DECREF(value);
-        value = PyObject_CallMethod(importlib,
-                                    "_install_external_importers", "");
-    }
     if (value == NULL) {
         PyErr_Print();
         return _Py_INIT_ERR("importlib install failed");