diff --git a/core/src/main/java/com/taobao/arthas/core/command/monitor200/HeapDumpCommand.java b/core/src/main/java/com/taobao/arthas/core/command/monitor200/HeapDumpCommand.java
index acce76fe4..3e02ef013 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/monitor200/HeapDumpCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/monitor200/HeapDumpCommand.java
@@ -51,7 +51,7 @@ public class HeapDumpCommand extends AnnotatedCommand {
     @Override
     public void process(CommandProcess process) {
         try {
-            String dumpFile = file == null ? (process.getArthasOutput().getAbsolutePath()+"heapdump"+System.currentTimeMillis()+".hprof") : null;
+            String dumpFile = file == null ? (process.getArthasOutput().getAbsolutePath()+File.separator+"heapdump-"+System.currentTimeMillis()+".hprof") : null;
             if (dumpFile == null || dumpFile.isEmpty()) {
                 String date = new SimpleDateFormat("yyyy-MM-dd-HH-mm").format(new Date());
                 File file = File.createTempFile("heapdump" + date + (live ? "-live" : ""), ".hprof");