diff --git a/commons/proguard-rules.pro b/commons/proguard-rules.pro
index 481bb4348..0f4c1eeb3 100644
--- a/commons/proguard-rules.pro
+++ b/commons/proguard-rules.pro
@@ -18,4 +18,6 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+#-renamesourcefileattribute SourceFile
+
+-keep class com.vitorpamplona.amethyst.commons.data.** { *; }
\ No newline at end of file