diff --git a/openvidu-server/src/main/java/io/openvidu/server/core/Participant.java b/openvidu-server/src/main/java/io/openvidu/server/core/Participant.java
index 5184c684..0da4aa25 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/core/Participant.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/core/Participant.java
@@ -272,7 +272,7 @@ public class Participant {
 	public JsonObject toJson() {
 		JsonObject json = new JsonObject();
 		json.addProperty("connectionId", this.participantPublicId);
-		json.addProperty("session", this.sessionId);
+		json.addProperty("sessionId", this.sessionId);
 		json.addProperty("createdAt", this.createdAt);
 		json.addProperty("location", this.location != null ? this.location.toString() : "unknown");
 		json.addProperty("platform", this.platform);