diff --git a/testlib/infra.py b/testlib/infra.py
index a6ad4e2..30b4deb 100644
--- a/testlib/infra.py
+++ b/testlib/infra.py
@@ -123,7 +123,7 @@ def check_result(result, format_str, format_str_args):
     remnant_pools = StratisDbus.pool_list()
     if remnant_pools != []:
         error_strings.append(
-            f'remnant pools: {", ".join(name for name in remnant_pools)}'
+            f'remnant pools: {", ".join(name for _, name, _ in remnant_pools)}'
         )
 
     (remnant_keys, return_code, message) = StratisDbus.get_keys()