diff --git a/F-Droid/proguard-rules.pro b/F-Droid/proguard-rules.pro
index 2edfcaca9..e0d139764 100644
--- a/F-Droid/proguard-rules.pro
+++ b/F-Droid/proguard-rules.pro
@@ -14,7 +14,7 @@
 # use reflection to instantiate classes, for example. If the keep flags are
 # removed, proguard will strip classes which are required, which may result in
 # crashes.
--keep class kellinwood.** {*;}
+-keep class kellinwood.security.zipsigner.** {*;}
 -keep class org.spongycastle.** {*;}
 
 # This keeps class members used for SystemInstaller IPC.