diff --git a/core/src/main/java/kafka/autobalancer/model/BrokerUpdater.java b/core/src/main/java/kafka/autobalancer/model/BrokerUpdater.java
index 630c847cad..39a419e88d 100644
--- a/core/src/main/java/kafka/autobalancer/model/BrokerUpdater.java
+++ b/core/src/main/java/kafka/autobalancer/model/BrokerUpdater.java
@@ -166,7 +166,7 @@ public int hashCode() {
         public String shortString() {
             return "Broker{" +
                     "brokerId=" + brokerId +
-                    "outOfDate=" + metricsOutOfDate +
+                    ", outOfDate=" + metricsOutOfDate +
                     ", slow=" + isSlowBroker +
                     ", " + timeString() +
                     ", " + loadString() +
@@ -184,7 +184,7 @@ public Broker copy() {
         public String toString() {
             return "Broker{" +
                     "brokerId=" + brokerId +
-                    "outOfDate=" + metricsOutOfDate +
+                    ", outOfDate=" + metricsOutOfDate +
                     ", slow=" + isSlowBroker +
                     ", " + super.toString() +
                     "}";
diff --git a/core/src/main/java/kafka/autobalancer/model/TopicPartitionReplicaUpdater.java b/core/src/main/java/kafka/autobalancer/model/TopicPartitionReplicaUpdater.java
index 462ac12f3f..231e51962a 100644
--- a/core/src/main/java/kafka/autobalancer/model/TopicPartitionReplicaUpdater.java
+++ b/core/src/main/java/kafka/autobalancer/model/TopicPartitionReplicaUpdater.java
@@ -109,7 +109,7 @@ public int hashCode() {
         public String shortString() {
             return "TopicPartitionReplica{" +
                     "tp=" + tp +
-                    "outOfDate=" + metricsOutOfDate +
+                    ", outOfDate=" + metricsOutOfDate +
                     ", " + timeString() +
                     ", " + loadString() +
                     "}";
@@ -126,7 +126,7 @@ public AbstractInstance copy() {
         public String toString() {
             return "TopicPartitionReplica{" +
                     "tp=" + tp +
-                    "outOfDate=" + metricsOutOfDate +
+                    ", outOfDate=" + metricsOutOfDate +
                     ", " + super.toString() +
                     "}";
         }