diff --git a/metadata/security.pEp.txt b/metadata/security.pEp.txt
index 86048150ed..de8c67039f 100644
--- a/metadata/security.pEp.txt
+++ b/metadata/security.pEp.txt
@@ -46,7 +46,9 @@ Build:1.0.100rc1.withoutKeysync,2
     subdir=k9mail
     gradle=WithoutkeysyncPlayStore
     srclibs=pEpJNIAdapter@cb23e18e4b88,pEpEngine@5ca43900bc58,yml2@2.5.5
-    prebuild=rm -vf src/main/res/xml/changelog_master.xml && \
+    prebuild=rm -vf ../tools/android-studio/settings.jar && \
+        rm -vf ../pEpJNIAdapter-debug/android-debug.aar && \
+        rm -vf src/main/res/xml/changelog_master.xml && \
         sed -i 's:file("../pEpJNIAdapter/android"):file("../srclib/pEpJNIAdapter/android"):' ../settings.gradle && \
         sed -i 's:YML2_PATH=.*$:YML2_PATH=../$$yml2$$:' $$pEpEngine$$/default.conf && \
         sed -i "s:yml2proc:../$$yml2$$/yml2proc:" $$pEpJNIAdapter$$/src/Makefile && \