diff --git a/core/src/main/scala/kafka/server/HighwaterMarkCheckpoint.scala b/core/src/main/scala/kafka/server/HighwaterMarkCheckpoint.scala
index 30caec1..af17932 100644
--- a/core/src/main/scala/kafka/server/HighwaterMarkCheckpoint.scala
+++ b/core/src/main/scala/kafka/server/HighwaterMarkCheckpoint.scala
@@ -36,7 +36,7 @@ object HighwaterMarkCheckpoint {
 
 class HighwaterMarkCheckpoint(val path: String) extends Logging {
   /* create the highwatermark file handle for all partitions */
-  val name = path + "/" + HighwaterMarkCheckpoint.highWatermarkFileName
+  val name = path + File.separator + HighwaterMarkCheckpoint.highWatermarkFileName
   private val hwFile = new File(name)
   private val hwFileLock = new ReentrantLock()
   // recover from previous tmp file, if required