diff --git a/_pytest/monkeypatch.py b/_pytest/monkeypatch.py
index 84cace731..fe54e63af 100644
--- a/_pytest/monkeypatch.py
+++ b/_pytest/monkeypatch.py
@@ -104,3 +104,4 @@ class monkeypatch:
         self._setitem[:] = []
         if hasattr(self, '_savesyspath'):
             sys.path[:] = self._savesyspath
+            del self._savesyspath