diff --git a/tools/run_tests.sh b/tools/run_tests.sh
index af8b32b3..b3a2e93d 100755
--- a/tools/run_tests.sh
+++ b/tools/run_tests.sh
@@ -1,3 +1,7 @@
 #!/bin/bash
 
-find $(dirname $0)/../weboob -name test.py | xargs nosetests -sv
+if [ "$1" != "" ]; then
+	nosetests -sv $(dirname $0)/../weboob/backends/$1
+else
+	find $(dirname $0)/../weboob -name test.py | xargs nosetests -sv
+fi