diff --git a/uriloader/exthandler/win/nsMIMEInfoWin.cpp b/uriloader/exthandler/win/nsMIMEInfoWin.cpp
index 918932bfb05e..261d3a8d4696 100644
--- a/uriloader/exthandler/win/nsMIMEInfoWin.cpp
+++ b/uriloader/exthandler/win/nsMIMEInfoWin.cpp
@@ -241,8 +241,7 @@ nsMIMEInfoWin::LoadUriInternal(nsIURI * aURL)
     SHELLEXECUTEINFOW sinfo;
     memset(&sinfo, 0, sizeof(sinfo));
     sinfo.cbSize   = sizeof(sinfo);
-    sinfo.fMask    = SEE_MASK_FLAG_DDEWAIT |
-      SEE_MASK_FLAG_NO_UI;
+    sinfo.fMask    = SEE_MASK_FLAG_DDEWAIT;
     sinfo.hwnd     = nullptr;
     sinfo.lpVerb   = (LPWSTR)&cmdVerb;
     sinfo.nShow    = SW_SHOWNORMAL;