diff --git a/urbackupserver_installer_win/urbackup_server.nsi b/urbackupserver_installer_win/urbackup_server.nsi
index f19e1432..88223ad1 100644
--- a/urbackupserver_installer_win/urbackup_server.nsi
+++ b/urbackupserver_installer_win/urbackup_server.nsi
@@ -201,8 +201,10 @@ Section "install"
 	SetOutPath "$INSTDIR\urbackup\www\images"
 	File "data_common\urbackup\www\images\*.png"
 	File "data_common\urbackup\www\images\*.gif"
+	Delete "$INSTDIR\urbackup\www\css\*.*"
 	SetOutPath "$INSTDIR\urbackup\www\css"	
 	File "data_common\urbackup\www\css\*.css"
+	Delete "$INSTDIR\urbackup\www\js\*.*"
 	SetOutPath "$INSTDIR\urbackup\www\js"
 	File "data_common\urbackup\www\js\*.js"
 	SetOutPath "$INSTDIR\urbackup\www\fonts"