diff --git a/examples/android-proguard-example/proguard.cfg b/examples/android-proguard-example/proguard.cfg
index 9a39a5e3..031e71f7 100644
--- a/examples/android-proguard-example/proguard.cfg
+++ b/examples/android-proguard-example/proguard.cfg
@@ -11,7 +11,7 @@
 #-keep class com.google.gson.stream.** { *; }
 
 # Application classes that will be serialized/deserialized over Gson
--keep class com.google.gson.examples.android.model.** { *; }
+-keep class com.google.gson.examples.android.model.** { <fields>; }
 
 # Prevent proguard from stripping interface information from TypeAdapterFactory,
 # JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)