diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index baeaae1c..e4b45cbc 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -57,4 +57,7 @@
 
 # Guava
 -dontwarn com.google.j2objc.annotations.**
--keep class com.google.j2objc.annotations.** { *; }
\ No newline at end of file
+-keep class com.google.j2objc.annotations.** { *; }
+
+# Enum
+-optimizations !class/unboxing/enum
\ No newline at end of file