diff --git a/musikr/consumer-rules.pro b/musikr/consumer-rules.pro
index 107fe2fb4..9c2a098af 100644
--- a/musikr/consumer-rules.pro
+++ b/musikr/consumer-rules.pro
@@ -1 +1,3 @@
--keep class org.oxycblt.musikr.metadata.NativeInputStream { *; }
\ No newline at end of file
+-keep class org.oxycblt.musikr.metadata.NativeInputStream { *; }
+-keep class org.oxycblt.musikr.metadata.Metadata { *; }
+-keep class org.oxycblt.musikr.metadata.Properties { *; }
\ No newline at end of file
diff --git a/musikr/proguard-rules.pro b/musikr/proguard-rules.pro
index 9847382a8..3f066b310 100644
--- a/musikr/proguard-rules.pro
+++ b/musikr/proguard-rules.pro
@@ -20,4 +20,6 @@
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
 
--keep class org.oxycblt.musikr.metadata.NativeInputStream { *; }
\ No newline at end of file
+-keep class org.oxycblt.musikr.metadata.NativeInputStream { *; }
+-keep class org.oxycblt.musikr.metadata.Metadata { *; }
+-keep class org.oxycblt.musikr.metadata.Properties { *; }
\ No newline at end of file