diff --git a/bin/tests/system/_common/rndc.conf b/bin/tests/system/_common/rndc.conf
index b887ec3eda..26420d5c6a 100644
--- a/bin/tests/system/_common/rndc.conf
+++ b/bin/tests/system/_common/rndc.conf
@@ -19,3 +19,9 @@ key rndc_key {
 	algorithm       hmac-sha256;
 	secret          "1234abcd8765";
 };
+
+/* Regresssion test for [GL #4991] */
+server example.com {
+	key rndc-key;
+	addresses { localhost; 127.0.0.1; ::1; };
+};