diff --git a/tools/build.bat b/tools/build.bat
index 32973803dc..05294fd579 100644
--- a/tools/build.bat
+++ b/tools/build.bat
@@ -1,4 +1,5 @@
 pushd ..\addons\
+del /q /f *.pbo
 for /D %%i in (*.*) do (
 	makepbo -NUP -@=z\addons\ace\%%i %%i ace_%%i.pbo
 	if %errorlevel% neq 0 exit /b %errorlevel%