diff --git a/sdk/java/src/main/java/io/juicefs/bench/TestDFSIO.java b/sdk/java/src/main/java/io/juicefs/bench/TestDFSIO.java
index f8385b12cac3..752fb9b92d48 100644
--- a/sdk/java/src/main/java/io/juicefs/bench/TestDFSIO.java
+++ b/sdk/java/src/main/java/io/juicefs/bench/TestDFSIO.java
@@ -584,6 +584,7 @@ private void runIOTest(
           Class<? extends Mapper<Text, LongWritable, Text, Text>> mapperClass,
           Path outputDir) throws IOException {
     JobConf job = new JobConf(config, TestDFSIO.class);
+    job.setBoolean("mapreduce.output.fileoutputformat.compress", false);
 
     FileInputFormat.setInputPaths(job, getControlDir(config));
     job.setInputFormat(SequenceFileInputFormat.class);