diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
index 7f48b610..59cb3ad2 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
@@ -475,6 +475,7 @@ public class AbstractAcmeClientTest {
 
             @Override
             public URI getLink(String relation) {
+                assertThat(relation, is("up"));
                 return certChainUri;
             }
         };