diff --git a/lib/__init__.py b/lib/__init__.py
index f733fb3..5b774f5 100644
--- a/lib/__init__.py
+++ b/lib/__init__.py
@@ -19,6 +19,5 @@ from .plotwav import *
 # this is similar to default behaviour of having no __all__ variable at all,
 # but ours ignores modules as well. this allows for `import sys` and such
 # without clobbering `from our_module import *`.
-__all__ = [
-    o for o in locals()
-    if type(o) != 'module' and not o.startswith('_')]
+__all__ = [k for k, v in locals().items()
+           if not __import__('inspect').ismodule(v) and not k.startswith('_')]