diff --git a/iis/build_modsecurity.bat b/iis/build_modsecurity.bat
index a9cf6dd0..393828c4 100644
--- a/iis/build_modsecurity.bat
+++ b/iis/build_modsecurity.bat
@@ -11,15 +11,18 @@ set CURRENT_DIR=%cd%
 
 cd ..\apache2
 del *.obj *.dll *.lib
+del libinjection\*.obj libinjection\*.dll libinjection\*.lib
 NMAKE -f Makefile.win APACHE=..\iis\%DEPENDENCIES_DIR%\Apache24 PCRE=..\iis\%DEPENDENCIES_DIR%\pcre LIBXML2=..\iis\%DEPENDENCIES_DIR%\libxml2 LUA=..\iis\%DEPENDENCIES_DIR%\lua\src VERSION=VERSION_IIS
 @if NOT (%ERRORLEVEL%) == (0) goto build_failed
 
 cd ..\mlogc
+del *.obj *.dll *.lib
 nmake -f Makefile.win clean
 nmake -f Makefile.win APACHE=..\iis\%DEPENDENCIES_DIR%\Apache24 PCRE=..\iis\%DEPENDENCIES_DIR%\pcre CURL=..\iis\%DEPENDENCIES_DIR%\curl VERSION=VERSION_IIS
 @if NOT (%ERRORLEVEL%) == (0) goto build_failed
 
 cd ..\iis
+del *.obj *.dll *.lib
 nmake -f Makefile.win clean
 NMAKE -f Makefile.win APACHE=..\iis\%DEPENDENCIES_DIR%\Apache24 PCRE=..\iis\%DEPENDENCIES_DIR%\pcre LIBXML2=..\iis\%DEPENDENCIES_DIR%\libxml2 LUA=..\iis\%DEPENDENCIES_DIR%\lua\src VERSION=VERSION_IIS
 @if NOT (%ERRORLEVEL%) == (0) goto build_failed