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-rw-r--r--coverage/data.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/data.py b/coverage/data.py
index 0b3b640b..db9cd526 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -668,7 +668,7 @@ class CoverageJsonData(object):
return self._arcs is not None
-which = os.environ.get("COV_STORAGE", "json")
+which = os.environ.get("COVERAGE_STORAGE", "json")
if which == "json":
CoverageData = CoverageJsonData
elif which == "sql":