diff --git a/Corona-Warn-App/proguard-rules.pro b/Corona-Warn-App/proguard-rules.pro
index a494dc86a67e75431934ce0fd0adeeab58b9ddee..963debea2879902c350ddfe929d199fbbecc605c 100644
--- a/Corona-Warn-App/proguard-rules.pro
+++ b/Corona-Warn-App/proguard-rules.pro
@@ -86,4 +86,8 @@
 
 ##---------------End: proguard configuration for Gson  ----------
 
--keep class de.rki.coronawarnapp.server.protocols.internal.** { *; }
\ No newline at end of file
+-keep class de.rki.coronawarnapp.server.protocols.internal.** { *; }
+
+-keepclassmembers class **.R$* {
+       public static <fields>;
+}
\ No newline at end of file