diff --git a/UnityPackager.Tests/PackerTest.cs b/UnityPackager.Tests/PackerTest.cs
index 867c0a1..80babcb 100644
--- a/UnityPackager.Tests/PackerTest.cs
+++ b/UnityPackager.Tests/PackerTest.cs
@@ -38,7 +38,8 @@ public void PackTest()
             Assert.Equal("A6-04-78-87-FC-41-65-97-76-D5-CB-4A-18-2F-33-7A", BitConverter.ToString(md5));
 
             string meta2 = File.ReadAllText("sample_out/sample2.txt.meta");
-            Assert.True(meta2.Contains("somethingelse"), "Packer should preserve our custom yaml files");
+            Assert.True(meta2.Contains("serializedVersion: 2"), "Packer should preserve our custom yaml files");
+            Assert.True(meta2.Contains("fileFormatVersion: 2"), "Packer should preserve file format");
         }
 
         [Fact]
@@ -65,7 +66,9 @@ public void RecursivePackTest()
             Assert.True(File.Exists("rsample_out/Assets/UnityPacker/box.png.meta"), "box.meta should have been decompressed");
 
             string meta2 = File.ReadAllText("rsample_out/Assets/UnityPacker/childfolder/sample2.txt.meta");
-            Assert.True(meta2.Contains("somethingelse"), "Packer should preserve our custom yaml files");
+            Assert.True(meta2.Contains("serializedVersion: 2"), "Packer should preserve our custom yaml files");
+            Assert.True(meta2.Contains("fileFormatVersion: 2"), "Packer should preserve file format");
+
         }
 
         private static byte[] GetMD5(string file)
diff --git a/UnityPackager.Tests/sample/childfolder/sample2.txt.meta b/UnityPackager.Tests/sample/childfolder/sample2.txt.meta
index 737a855..3e12e82 100644
--- a/UnityPackager.Tests/sample/childfolder/sample2.txt.meta
+++ b/UnityPackager.Tests/sample/childfolder/sample2.txt.meta
@@ -1,3 +1,11 @@
-guid: F97417BE8FA0C9BF60F86625A5ABDE62
 fileFormatVersion: 2
-somethingelse: 3
+guid: 0aa3018bb284840d6a6d0acee29ab098
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
\ No newline at end of file
diff --git a/UnityPackager/Packer.cs b/UnityPackager/Packer.cs
index 062d3a2..ed019db 100644
--- a/UnityPackager/Packer.cs
+++ b/UnityPackager/Packer.cs
@@ -84,7 +84,7 @@ private static void SaveMeta(string metaPath, YamlDocument meta)
         {
             using (StreamWriter writer = new StreamWriter(metaPath))
             {
-                new YamlStream(meta).Save(writer);
+                new YamlStream(meta).Save(writer, false);
             }
 
             FileInfo metaFile = new FileInfo(metaPath);