diff --git a/pupy/packages/all/pupyimporter.py b/pupy/packages/all/pupyimporter.py
index c3629222..5aded9ab 100644
--- a/pupy/packages/all/pupyimporter.py
+++ b/pupy/packages/all/pupyimporter.py
@@ -205,6 +205,8 @@ def has_module(name):
     return name in sys.modules
 
 def invalidate_module(name):
+    import pupy
+
     global modules
     global __debug