diff --git a/spi/src/main/java/org/opensearch/jobscheduler/spi/LockModel.java b/spi/src/main/java/org/opensearch/jobscheduler/spi/LockModel.java
index 2da7d561..95e04b01 100644
--- a/spi/src/main/java/org/opensearch/jobscheduler/spi/LockModel.java
+++ b/spi/src/main/java/org/opensearch/jobscheduler/spi/LockModel.java
@@ -13,6 +13,7 @@
 import org.opensearch.common.xcontent.XContentBuilder;
 import org.opensearch.common.xcontent.XContentParser;
 import org.opensearch.common.xcontent.XContentParserUtils;
+import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.index.seqno.SequenceNumbers;
 
 import java.io.IOException;
@@ -173,7 +174,7 @@ public XContentBuilder toXContent(final XContentBuilder builder, final Params pa
 
     @Override
     public String toString() {
-        return Strings.toString(this, false, true);
+        return Strings.toString(XContentType.JSON, this, false, true);
     }
 
     public String getLockId() {
diff --git a/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/CronSchedule.java b/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/CronSchedule.java
index afa7923d..cbd00849 100644
--- a/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/CronSchedule.java
+++ b/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/CronSchedule.java
@@ -18,6 +18,7 @@
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.io.stream.StreamOutput;
 import org.opensearch.common.xcontent.XContentBuilder;
+import org.opensearch.common.xcontent.XContentType;
 
 import java.io.IOException;
 import java.time.Clock;
@@ -180,7 +181,7 @@ private XContentBuilder toXContentWithDelay(XContentBuilder builder) throws IOEx
 
     @Override
     public String toString() {
-        return Strings.toString(this, false, true);
+        return Strings.toString(XContentType.JSON, this, false, true);
     }
 
     @Override
diff --git a/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/IntervalSchedule.java b/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/IntervalSchedule.java
index 19e927cb..6d142d8e 100644
--- a/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/IntervalSchedule.java
+++ b/spi/src/main/java/org/opensearch/jobscheduler/spi/schedule/IntervalSchedule.java
@@ -15,6 +15,7 @@
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.io.stream.StreamOutput;
 import org.opensearch.common.xcontent.XContentBuilder;
+import org.opensearch.common.xcontent.XContentType;
 
 import java.io.IOException;
 import java.time.Clock;
@@ -188,7 +189,7 @@ void setClock(Clock clock) {
 
     @Override
     public String toString() {
-        return Strings.toString(this, false, true);
+        return Strings.toString(XContentType.JSON, this, false, true);
     }
 
     @Override