diff --git a/app/proguard.pro b/app/proguard.pro
index 6578a3678..6ccbb322c 100644
--- a/app/proguard.pro
+++ b/app/proguard.pro
@@ -27,6 +27,7 @@
 -dontwarn org.codehaus.groovy.**
 -dontwarn org.apache.log4j.**             # ignore warnings from log4j dependency
 -dontwarn com.github.erosb.jsonsKema.**   # ical4android
+-dontwarn org.jparsec.**                  # ical4android
 -keep class net.fortuna.ical4j.** { *; }  # keep all model classes (properties/factories, created at runtime)
 -keep class at.bitfire.** { *; }       # all DAVdroid code is required