diff --git a/test/test_utils.py b/test/test_utils.py
index 84b966ed..33353de1 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -51,14 +51,15 @@ class TestSetupReadline(unittest.TestCase):
         self.namespace.sys = sys
         self.namespace.os = os
 
-        assert self.completions('os.path.join') == ['os.path.join']
-        assert self.completions('os.path.join().upper') == ['os.path.join().upper']
+        try:
+            assert self.completions('os.path.join') == ['os.path.join']
+            assert self.completions('os.path.join().upper') == ['os.path.join().upper']
 
-        c = set(['os.' + d for d in dir(os) if d.startswith('ch')])
-        assert set(self.completions('os.ch')) == set(c)
-
-        del self.namespace.sys
-        del self.namespace.os
+            c = set(['os.' + d for d in dir(os) if d.startswith('ch')])
+            assert set(self.completions('os.ch')) == set(c)
+        finally:
+            del self.namespace.sys
+            del self.namespace.os
 
     def test_calls(self):
         s = 'str(bytes'