diff --git a/scripts/diagnose.sh b/scripts/diagnose.sh
index b227db4..24c2020 100755
--- a/scripts/diagnose.sh
+++ b/scripts/diagnose.sh
@@ -357,7 +357,7 @@ info "Force OBD_PROTOCOL=6:     sudo systemctl edit $SERVICE"
 info "  (add: Environment=OBD_PROTOCOL=6  then restart)"
 info "Skip voltage check:       sudo systemctl edit $SERVICE"
 info "  (add: Environment=OBD_SKIP_VOLTAGE_CHECK=1  then restart)"
-info "DB backup:                cp $DB_PATH ${DB_PATH}.bak.\$(date +%Y%m%d_%H%M%S)"
+info "DB backup:                cp \$DB_PATH \${DB_PATH}.bak.\$(date +%Y%m%d_%H%M%S)"
 info "Recompute trips:          curl http://localhost:5000/api/trips/refresh"
 info "Check USB devices:        lsusb && ls /dev/ttyUSB*"
 info "Check serial port:        ls -la /dev/serial0"