diff --git a/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java b/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
index a89f5beb..4a2f65d4 100644
--- a/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
+++ b/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
@@ -20,7 +20,7 @@ import brut.common.BrutException;
 import brut.directory.FileDirectory;
 import brut.util.OS;
 import java.io.*;
-import java.util.HashMap;
+import java.util.Map;
 import java.util.Set;
 import java.util.logging.Logger;
 
@@ -214,6 +214,22 @@ public class BuildAndDecodeTest {
         compareLibsFolder("libs");
     }
 
+    @Test
+    public void unknownFolderTest() throws BrutException, IOException {
+        compareUnknownFiles();
+    }
+
+    private void compareUnknownFiles() throws BrutException, IOException {
+        Map<String, Object> control = new Androlib().readMetaFile(sTestOrigDir);
+        Map<String, Object> test = new Androlib().readMetaFile(sTestNewDir);
+        assertTrue(control.containsKey("unknownFiles"));
+        assertTrue(test.containsKey("unknownFiles"));
+
+        Map<String, String> control_files = (Map<String, String>)control.get("unknownFiles");
+        Map<String, String> test_files = (Map<String, String>)test.get("unknownFiles");
+        assertTrue(control_files.size() == test_files.size());
+    }
+
     private boolean compareBinaryFolder(String path, boolean res) throws BrutException, IOException {
 
         String tmp = "";
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
index 92fd3b17..51536bc9 100644
--- a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
@@ -4,10 +4,13 @@ isFrameworkApk: false
 usesFramework:
   ids:
   - 1
+packageInfo:
+  forced-package-id: '127'
 versionInfo:
   versionCode: '1'
   versionName: '1.0'
 compressionType: false
 unknownFiles:
   hidden.file: '8'
-  unk_folder/unknown_file: '8'
\ No newline at end of file
+  unk_folder/unknown_file: '8'
+  lib_bug603/bug603: '8'
\ No newline at end of file
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/lib_bug603/bug603 b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/lib_bug603/bug603
new file mode 100644
index 00000000..08d7f232
--- /dev/null
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/lib_bug603/bug603
@@ -0,0 +1 @@
+https://code.google.com/p/android-apktool/issues/detail?id=603
\ No newline at end of file