diff --git a/bramble-android/proguard-rules.txt b/bramble-android/proguard-rules.txt
index fee1df635..c34540941 100644
--- a/bramble-android/proguard-rules.txt
+++ b/bramble-android/proguard-rules.txt
@@ -18,3 +18,7 @@
 -dontnote com.google.common.**
 
 -dontwarn com.fasterxml.jackson.databind.ext.Java7SupportImpl
+
+# Keep all Jackson-serialisable classes and their members
+-keep interface com.fasterxml.jackson.databind.annotation.JsonSerialize
+-keep @com.fasterxml.jackson.databind.annotation.JsonSerialize class * { *; }