diff --git a/include/mshtml.idl b/include/mshtml.idl
index 1ea4b5bc99..8284b255cb 100644
--- a/include/mshtml.idl
+++ b/include/mshtml.idl
@@ -9772,7 +9772,7 @@ interface IHTMLSelection : IDispatch
     [id(DISPID_IHTMLSELECTION_COLLAPSE)]
     HRESULT collapse(
         [in] IDispatch *parentNode,
-        [in] long offfset);
+        [in] long offset);
 
     [id(DISPID_IHTMLSELECTION_COLLAPSETOSTART)]
     HRESULT collapseToStart();