diff --git a/conf/distro/mortsgna.conf b/conf/distro/mortsgna.conf
index da8ac7a..ad8ee95 100644
--- a/conf/distro/mortsgna.conf
+++ b/conf/distro/mortsgna.conf
@@ -115,6 +115,8 @@ EXTRA_IMAGE_FEATURES += " \
     allow-empty-password \
     post-install-logging \
 "
+# Ensure postinst.log non volatile
+POSTINST_LOGFILE = "${localstatedir}/postinstall.log"
 
 # make x11-base a valid IMAGE_FEATURES
 IMAGE_FEATURES[validitems] += "x11-base"