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-rw-r--r--coverage/control.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/coverage/control.py b/coverage/control.py
index 07551ff..44a70bf 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -214,7 +214,8 @@ class coverage(object):
def _canonical_dir(self, morf):
"""Return the canonical directory of the module or file `morf`."""
- return os.path.split(PythonCodeUnit(morf, self.file_locator).filename)[0]
+ morf_filename = PythonCodeUnit(morf, self.file_locator).filename
+ return os.path.split(morf_filename)[0]
def _source_for_file(self, filename):
"""Return the source file for `filename`."""