diff --git a/Lib/pkgutil.py b/Lib/pkgutil.py
--- a/Lib/pkgutil.py
+++ b/Lib/pkgutil.py
@@ -461,9 +461,12 @@
         loader = getattr(module, '__loader__', None)
         if loader is not None:
             return loader
+        if getattr(module, '__spec__', None) is None:
+            return None
         fullname = module.__name__
     else:
         fullname = module_or_name
+    # XXX Turn ImportError into None here?
     return find_loader(fullname)
 
 
diff --git a/Lib/test/test_pkgutil.py b/Lib/test/test_pkgutil.py
--- a/Lib/test/test_pkgutil.py
+++ b/Lib/test/test_pkgutil.py
@@ -1,4 +1,4 @@
-from test.support import run_unittest, unload, check_warnings
+from test.support import run_unittest, unload, check_warnings, CleanImport
 import unittest
 import sys
 import importlib
@@ -345,6 +345,23 @@
         finally:
             __loader__ = this_loader
 
+    def test_get_loader_handles_missing_spec_attribute(self):
+        name = 'spam'
+        mod = type(sys)(name)
+        del mod.__spec__
+        with CleanImport(name):
+            sys.modules[name] = mod
+            loader = pkgutil.get_loader(name)
+        self.assertIsNone(loader)
+
+    def test_get_loader_handles_spec_attribute_none(self):
+        name = 'spam'
+        mod = type(sys)(name)
+        mod.__spec__ = None
+        with CleanImport(name):
+            sys.modules[name] = mod
+            loader = pkgutil.get_loader(name)
+        self.assertIsNone(loader)
 
     def test_find_loader_avoids_emulation(self):
         with check_warnings() as w: