diff --git a/k9mail/proguard-rules.pro b/k9mail/proguard-rules.pro
index 3cbaf1676c7..18eb79bb164 100644
--- a/k9mail/proguard-rules.pro
+++ b/k9mail/proguard-rules.pro
@@ -21,3 +21,5 @@
 -dontnote com.fsck.k9.PRNGFixes
 -dontnote com.fsck.k9.ui.messageview.**
 -dontnote com.fsck.k9.view.**
+
+-keep public class org.openintents.openpgp.**