diff --git a/clients/src/test/java/org/apache/kafka/clients/admin/MockAdminClient.java b/clients/src/test/java/org/apache/kafka/clients/admin/MockAdminClient.java
index 192eb6649a2b..239e8b728d56 100644
--- a/clients/src/test/java/org/apache/kafka/clients/admin/MockAdminClient.java
+++ b/clients/src/test/java/org/apache/kafka/clients/admin/MockAdminClient.java
@@ -1017,7 +1017,13 @@ synchronized public DescribeLogDirsResult describeLogDirs(Collection<Integer> br
                 for (Node node : nodes) {
                     Map<String, LogDirDescription> logDirDescriptionMap = unwrappedResults.get(node.id());
                     LogDirDescription logDirDescription = logDirDescriptionMap.getOrDefault(partitionLogDirs.get(0), new LogDirDescription(null, new HashMap<>()));
-                    logDirDescription.replicaInfos().put(new TopicPartition(topicName, topicPartitionInfo.partition()), new ReplicaInfo(0, 0, false));
+                    Map<TopicPartition, ReplicaInfo> topicPartitionReplicaInfoMap = new HashMap<>(logDirDescription.replicaInfos());
+                    topicPartitionReplicaInfoMap.put(new TopicPartition(topicName, topicPartitionInfo.partition()), new ReplicaInfo(0, 0, false));
+                    logDirDescriptionMap.put(partitionLogDirs.get(0), new LogDirDescription(
+                        logDirDescription.error(),
+                        topicPartitionReplicaInfoMap,
+                        logDirDescription.totalBytes().orElse(DescribeLogDirsResponse.UNKNOWN_VOLUME_BYTES),
+                        logDirDescription.usableBytes().orElse(DescribeLogDirsResponse.UNKNOWN_VOLUME_BYTES)));
                 }
             }
         }