1 files changed, 1 insertions, 1 deletions
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
index b7d6e0a9dd9..714374ccb8a 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
@@ -176,7 +176,7 @@ public class MockNodeRepository extends NodeRepository {
                           .build());
 
         // Ready all nodes, except 7 and 55
-        nodes = nodes().addNodes(nodes, Agent.system);
+        nodes = new ArrayList<>(nodes().addNodes(nodes, Agent.system));
         nodes.remove(node7);
         nodes.remove(node55);
         nodes = nodes().deallocate(nodes, Agent.system, getClass().getSimpleName());