diff --git a/src/msw/toplevel.cpp b/src/msw/toplevel.cpp
index 44aae3b980..cf47527062 100644
--- a/src/msw/toplevel.cpp
+++ b/src/msw/toplevel.cpp
@@ -156,6 +156,8 @@ WXDWORD wxTopLevelWindowMSW::MSWGetStyle(long style, WXDWORD *exflags) const
     // border and caption styles
     if ( style & wxRESIZE_BORDER )
         msflags |= WS_THICKFRAME;
+    else if ( exflags && ((style & wxBORDER_DOUBLE) || (style & wxBORDER_RAISED)) )
+        *exflags |= WS_EX_DLGMODALFRAME;
     else if ( !(style & wxBORDER_NONE) )
         msflags |= WS_BORDER;
     else