diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 1ac740d49..f2fa628ae 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -218,6 +218,7 @@
 -keep class com.sun.script.javascript.** { *; }
 -keep class org.mozilla.classfile.** { *; }
 -keep class org.mozilla.javascript.** { *; }
+-dontwarn org.mozilla.javascript.engine.RhinoScriptEngineFactory
 
 ###EPUB
 -dontwarn nl.siegmann.epublib.**