diff --git a/build_clang.bat b/build_clang.bat
index 27210c4..fa986c6 100644
--- a/build_clang.bat
+++ b/build_clang.bat
@@ -1,5 +1,7 @@
 @echo off
-rmdir /S /Q build
+if exist build (
+  rmdir /s /q build
+)
 mkdir build
 
 pushd build