diff --git a/test/python/coverage.ini b/test/python/coverage.ini
index 14a8e48bd..80e95de18 100644
--- a/test/python/coverage.ini
+++ b/test/python/coverage.ini
@@ -4,3 +4,4 @@ omit =
     *.cti
     stringsource
 source = ../../build/python/cantera
+branch = true