diff --git a/product/ERP5Type/tests/runUnitTest.py b/product/ERP5Type/tests/runUnitTest.py
index 5da38b785b28fce6bb468f8b9e0739d28760d736..a9300457b2dff96b41956a9e5d81e51be2884b17 100755
--- a/product/ERP5Type/tests/runUnitTest.py
+++ b/product/ERP5Type/tests/runUnitTest.py
@@ -539,7 +539,7 @@ def runUnitTestList(test_list, verbosity=1, debug=0):
     os.chdir(instance_home)
     if save_mysql:
       save_mysql(verbosity)
-    if suite not in (ProcessingNodeTestCase, ZEOServerTestCase):
+    if suite.__class__ not in (ProcessingNodeTestCase, ZEOServerTestCase):
       # Static files are modified by the node installing business templates,
       # i.e. by the node running the unit test. There is no point saving them
       # on a ZEO server, or on nodes that only process activities: this has to