diff --git a/paystack/proguard-rules.pro b/paystack/proguard-rules.pro
index ae35fb8..77e0b4b 100644
--- a/paystack/proguard-rules.pro
+++ b/paystack/proguard-rules.pro
@@ -1 +1,2 @@
 -keepclassmembers class co.paystack.android.api.model.** { <fields>; }
+-keepclassmembers class co.paystack.android.model.AvsState { <fields>; }