diff --git a/recipes-support/vnstat/vnstat_2.6.bb b/recipes-support/vnstat/vnstat_2.6.bb
index 9a650f4..03e1dba 100644
--- a/recipes-support/vnstat/vnstat_2.6.bb
+++ b/recipes-support/vnstat/vnstat_2.6.bb
@@ -13,6 +13,18 @@ inherit autotools pkgconfig systemd
 
 EXTRA_OECONF = "--disable-extra-paths"
 
+do_configure_append() {
+    # enable a volatile and persistent path for reading and writing the data base:
+    sed -i 's|ReadWritePaths=\/var\/lib|ReadWritePaths=\/var\/lib \/run\/|g' ${S}/examples/systemd/vnstat.service
+
+    # adapt the default config running in volatile mode
+    sed -i 's|DatabaseDir \"\/var\/lib\/vnstat\"|DatabaseDir \"\/run\/vnstat\"|g' ${S}/cfg/vnstat.conf
+
+    # add wwan0 as default interface
+    sed -i 's|Interface \"\"|Interface \"wwan0\"|g' ${S}/cfg/vnstat.conf
+}
+
+
 do_install_append() {
     install -Dm644 ${S}/examples/systemd/vnstat.service "${D}${systemd_system_unitdir}/vnstat.service"
 }