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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 94d83302..78590fea 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -451,7 +451,7 @@ class CoverageData(object):
# Write the data to the file.
file_obj.write(self._GO_AWAY)
- json.dump(file_data, file_obj)
+ json.dump(file_data, file_obj, separators=(',', ':'))
def write_file(self, filename):
"""Write the coverage data to `filename`."""