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-rw-r--r--coverage/test_helpers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/test_helpers.py b/coverage/test_helpers.py
index f36be70b..86304c2b 100644
--- a/coverage/test_helpers.py
+++ b/coverage/test_helpers.py
@@ -49,7 +49,7 @@ class ModuleAwareMixin(TestCase):
super(ModuleAwareMixin, self).setUp()
# Record sys.modules here so we can restore it in cleanup_modules.
- self.old_modules = dict(sys.modules)
+ self.old_modules = list(sys.modules)
self.addCleanup(self.cleanup_modules)
def cleanup_modules(self):