diff --git a/smmap/mman.py b/smmap/mman.py
index 7180c75..975fafa 100644
--- a/smmap/mman.py
+++ b/smmap/mman.py
@@ -131,6 +131,7 @@ def use_region(self, offset=0, size=0, flags=0):
# END need region handling
self._ofs = offset - self._region._b
+ assert(self._ofs > -1)
self._size = min(size, self._region.ofs_end() - offset)
return self
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