diff --git a/build/build-bifromq-starter/bin/standalone.bat b/build/build-bifromq-starter/bin/standalone.bat
index 64ed84f08..ad8e0502b 100755
--- a/build/build-bifromq-starter/bin/standalone.bat
+++ b/build/build-bifromq-starter/bin/standalone.bat
@@ -19,7 +19,7 @@
 @echo off
 
 setlocal enabledelayedexpansion
-if [%1] EQU [] (b
+if [%1] EQU [] (
     call :usage %0
     exit /b 1
 )