diff --git a/debian/rules b/debian/rules
index 8d8060e..2c5cc2d 100755
--- a/debian/rules
+++ b/debian/rules
@@ -30,7 +30,7 @@
 		rm -rf .testrepository ; \
 		testr-python$$PYMAJOR init ; \
 		TEMP_REZ=`mktemp -t` ; \
-		PYTHONPATH=$(CURDIR) PYTHON=python$$i testr-python$$PYMAJOR run --subunit | tee $$TEMP_REZ | subunit2pyunit ; \
+		PYTHONPATH=$(CURDIR) PYTHON=python$$i testr-python$$PYMAJOR run --subunit 'castellan\.tests\.unit.*' | tee $$TEMP_REZ | subunit2pyunit ; \
 		cat $$TEMP_REZ | subunit-filter -s --no-passthrough | subunit-stats ; \
 		rm -f $$TEMP_REZ ; \
 		testr-python$$PYMAJOR slowest ; \