diff --git a/dlls/mshtml/htmldoc.c b/dlls/mshtml/htmldoc.c
index 84f6cc81d97..7a7b3439350 100644
--- a/dlls/mshtml/htmldoc.c
+++ b/dlls/mshtml/htmldoc.c
@@ -1072,15 +1072,19 @@ static HRESULT WINAPI HTMLDocument_get_onkeypress(IHTMLDocument2 *iface, VARIANT
 static HRESULT WINAPI HTMLDocument_put_onmouseup(IHTMLDocument2 *iface, VARIANT v)
 {
     HTMLDocument *This = HTMLDOC_THIS(iface);
-    FIXME("(%p)\n", This);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%s)\n", This, debugstr_variant(&v));
+
+    return set_doc_event(This, EVENTID_MOUSEUP, &v);
 }
 
 static HRESULT WINAPI HTMLDocument_get_onmouseup(IHTMLDocument2 *iface, VARIANT *p)
 {
     HTMLDocument *This = HTMLDOC_THIS(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    return get_doc_event(This, EVENTID_MOUSEUP, p);
 }
 
 static HRESULT WINAPI HTMLDocument_put_onmousedown(IHTMLDocument2 *iface, VARIANT v)