diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 4ad9610..3fe0269 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -34,6 +34,7 @@
 
 # Smbj
 -keep class com.hierynomus.** { *; }
+-keep class net.engio.mbassy.** { *; }
 
 # Zxing
 -keep class com.google.zxing.** { *; }