diff --git a/src/html/helpwnd.cpp b/src/html/helpwnd.cpp
index a3e4d7c1cf..d4be6593e4 100644
--- a/src/html/helpwnd.cpp
+++ b/src/html/helpwnd.cpp
@@ -367,6 +367,7 @@ bool wxHtmlHelpWindow::Create(wxWindow* parent, wxWindowID id,
         long splitterStyle = wxSP_3D;
         // Drawing moving sash can cause problems on wxMac
 #ifdef __WXMAC__
+        splitterStyle = 0; // 3D style looks poor on Mac
         splitterStyle |= wxSP_LIVE_UPDATE;
 #endif
         m_Splitter = new wxSplitterWindow(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, splitterStyle);