diff --git a/core/src/main/scala/org/apache/spark/deploy/worker/ui/LogPage.scala b/core/src/main/scala/org/apache/spark/deploy/worker/ui/LogPage.scala
index 53f8f9a46cf8d..5a1d06eb87db9 100644
--- a/core/src/main/scala/org/apache/spark/deploy/worker/ui/LogPage.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/worker/ui/LogPage.scala
@@ -159,7 +159,7 @@ private[ui] class LogPage(parent: WorkerWebUI) extends WebUIPage("logPage") with
           offset
         }
       }
-      val endIndex = math.min(startIndex + totalLength, totalLength)
+      val endIndex = math.min(startIndex + byteLength, totalLength)
       logDebug(s"Getting log from $startIndex to $endIndex")
       val logText = Utils.offsetBytes(files, startIndex, endIndex)
       logDebug(s"Got log of length ${logText.length} bytes")