diff --git a/receiver/prometheusreceiver/targetallocator/testdata/config.yaml b/receiver/prometheusreceiver/targetallocator/testdata/config.yaml
index 2f243000155d6..0cc7f0d1236c4 100644
--- a/receiver/prometheusreceiver/targetallocator/testdata/config.yaml
+++ b/receiver/prometheusreceiver/targetallocator/testdata/config.yaml
@@ -3,5 +3,6 @@ target_allocator:
   timeout: 5s
   tls:
     cert_file: "client.crt"
+    key_file: "client.key"
   interval: 30s
   collector_id: collector-1