diff --git a/astrid/proguard.cfg b/astrid/proguard.cfg
index 38aac649f..d708d754d 100644
--- a/astrid/proguard.cfg
+++ b/astrid/proguard.cfg
@@ -11,6 +11,7 @@
 -keep, allowshrinking, allowoptimization class com.todoroo.**
 -keep class com.mdimension.**
 -keep class com.google.common.base.Preconditions
+-keep class * extends com.todoroo.andlib.data.AbstractModel
 
 # ignore reflection-based access from google libraries
 -dontwarn com.google.**