diff --git a/app/scanner/mainwindow.cpp b/app/scanner/mainwindow.cpp
index b33f6743..f8cf4a74 100644
--- a/app/scanner/mainwindow.cpp
+++ b/app/scanner/mainwindow.cpp
@@ -3220,7 +3220,7 @@ void MainWindow::on_act_help_triggered()
 #elif defined(OEM_ZHONGJING)
         filename = "/opt/apps/scanner-driver-microtek/doc/MicrotekScan_App_Help_manual.pdf";
 #elif defined(OEM_ZIGUANG)
-        filename = "/opt/apps/scanner-driver-unis/doc/UnisScan_App_Help_manual.pdf";
+        filename = "/opt/apps/scanner-driver-unis/doc/UniScan_App_Help_manual.pdf";
 #else
         filename = "/opt/apps/scanner-driver-huagao/doc/HuaGoScan_App_Help_manual.pdf";
 #endif