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-rw-r--r--regtest/backends/cairo.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/regtest/backends/cairo.py b/regtest/backends/cairo.py
index a990ddf7..304783ea 100644
--- a/regtest/backends/cairo.py
+++ b/regtest/backends/cairo.py
@@ -23,7 +23,7 @@ import os
class Cairo(Backend):
def __init__(self, name):
- Backend.__init__(self, name)
+ Backend.__init__(self, name, '.diff.png')
self._pdftocairo = os.path.join(self._utilsdir, 'pdftocairo');
def create_refs(self, doc_path, refs_path):