diff --git a/ultrasonic/minify/proguard-main.pro b/ultrasonic/minify/proguard-main.pro
index e8026c1a..1b2f4d29 100644
--- a/ultrasonic/minify/proguard-main.pro
+++ b/ultrasonic/minify/proguard-main.pro
@@ -2,3 +2,4 @@
 
 ### Don't remove subsonic api serializers/entities
 -keep class org.moire.ultrasonic.api.subsonic.response.** { *; }
+-keep class org.moire.ultrasonic.api.subsonic.models.** { *; }