diff --git a/metaphony/proguard-rules.pro b/metaphony/proguard-rules.pro
index 481bb434..dd723b2f 100644
--- a/metaphony/proguard-rules.pro
+++ b/metaphony/proguard-rules.pro
@@ -1,21 +1,6 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+-keep class me.zyrouge.symphony.metaphony.AudioMetadataParser {
+    void putTag(java.lang.String, java.lang.String);
+    void putPicture(java.lang.String, java.lang.String, byte[]);
+    void putAudioProperty(java.lang.String, int);
+    boolean readMetadata(java.lang.String, int);
+}
\ No newline at end of file