diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index a4eb2c039..31e2c39fd 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -80,4 +80,7 @@
 -keep class com.google.api.services.** { *; }
 
 # Google OAuth
--keep class com.google.api.client.** { *; }
\ No newline at end of file
+-keep class com.google.api.client.** { *; }
+
+# Keep backup models, otherwise gson fails on release builds.
+-keep class eu.kanade.tachiyomi.data.backup.models.** { *; }
\ No newline at end of file