diff --git a/dlls/jscript/dispex.c b/dlls/jscript/dispex.c
index da23d18aa26..3c2733086b7 100644
--- a/dlls/jscript/dispex.c
+++ b/dlls/jscript/dispex.c
@@ -1083,6 +1083,7 @@ HRESULT jsdisp_get_id(jsdisp_t *jsdisp, const WCHAR *name, DWORD flags, DISPID *
     }
 
     TRACE("not found %s\n", debugstr_w(name));
+    *id = DISPID_UNKNOWN;
     return DISP_E_UNKNOWNNAME;
 }