diff --git a/wear/proguard-rules.pro b/wear/proguard-rules.pro
index 3d17f7151..5d116e53f 100644
--- a/wear/proguard-rules.pro
+++ b/wear/proguard-rules.pro
@@ -10,4 +10,5 @@
     public static *** i(...);
 }
 
--dontwarn com.google.android.gms.**
\ No newline at end of file
+-dontwarn com.google.android.gms.**
+-keepclassmembers class * extends com.google.protobuf.GeneratedMessageLite { <fields>; }