diff --git a/src/test/setup/radius-config/freeradius/certs_2/index.txt.attr.old b/src/test/setup/radius-config/freeradius/certs_2/index.txt.attr.old
new file mode 100644
index 0000000..8f7e63a
--- /dev/null
+++ b/src/test/setup/radius-config/freeradius/certs_2/index.txt.attr.old
@@ -0,0 +1 @@
+unique_subject = yes