diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/ObjectEvent.scala b/internal/util-logging/src/main/scala/sbt/internal/util/ObjectEvent.scala
index fdf4d8789..c75e09a1e 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/ObjectEvent.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/ObjectEvent.scala
@@ -15,6 +15,8 @@ final class ObjectEvent[A](
   val contentType: String,
   val json: JValue
 ) extends Serializable {
+  override def toString: String =
+    s"ObjectEvent($level, $message, $channelName, $execId, $contentType, $json)"
 }
 
 object ObjectEvent {