diff --git a/core/src/main/scala/org/apache/spark/network/ConnectionManager.scala b/core/src/main/scala/org/apache/spark/network/ConnectionManager.scala
index e77d762bdf22..b3e951ded6e7 100644
--- a/core/src/main/scala/org/apache/spark/network/ConnectionManager.scala
+++ b/core/src/main/scala/org/apache/spark/network/ConnectionManager.scala
@@ -467,7 +467,7 @@ private[spark] class ConnectionManager(
 
           val sendingConnectionOpt = connectionsById.get(remoteConnectionManagerId)
           if (!sendingConnectionOpt.isDefined) {
-            logError("Corresponding SendingConnectionManagerId not found")
+            logError(s"Corresponding SendingConnection to ${remoteConnectionManagerId} not found")
             return
           }