diff --git a/tlz/_build_tlz.py b/tlz/_build_tlz.py
index 3c017a54..f29eed1b 100644
--- a/tlz/_build_tlz.py
+++ b/tlz/_build_tlz.py
@@ -63,7 +63,10 @@ def exec_module(self, module):
             module.__doc__ = fast_mod.__doc__
 
         # show file from toolz during introspection
-        module.__file__ = slow_mod.__file__
+        try:
+            module.__file__ = slow_mod.__file__
+        except AttributeError:
+            pass
 
         for k, v in fast_mod.__dict__.items():
             tv = slow_mod.__dict__.get(k)
diff --git a/toolz/tests/test_tlz.py b/toolz/tests/test_tlz.py
index ed2646a8..c449f607 100644
--- a/toolz/tests/test_tlz.py
+++ b/toolz/tests/test_tlz.py
@@ -46,8 +46,10 @@ def test_tlz():
     except ImportError:
         pass
 
-    assert tlz.__file__ == toolz.__file__
-    assert tlz.functoolz.__file__ == toolz.functoolz.__file__
+    if hasattr(tlz, '__file__'):
+        assert tlz.__file__ == toolz.__file__
+    if hasattr(tlz.functoolz, '__file__'):
+        assert tlz.functoolz.__file__ == toolz.functoolz.__file__
 
     assert tlz.pipe is toolz.pipe