diff --git a/gui/help/buildhelp.bat b/gui/help/buildhelp.bat
index 02685f10a..c7bf58dad 100644
--- a/gui/help/buildhelp.bat
+++ b/gui/help/buildhelp.bat
@@ -1 +1,4 @@
+del online-help.qhc
+del online-help.qch
+
 qcollectiongenerator online-help.qhcp -o online-help.qhc
\ No newline at end of file