diff --git a/src/propgrid/advprops.cpp b/src/propgrid/advprops.cpp
index b0c3f4fee0..4cbe13f12c 100644
--- a/src/propgrid/advprops.cpp
+++ b/src/propgrid/advprops.cpp
@@ -1237,6 +1237,7 @@ bool wxSystemColourProperty::QueryColourFromUser( wxVariant& variant ) const
 
     wxColourData data;
     data.SetChooseFull(true);
+    data.SetChooseAlpha(GetAttributeAsLong(wxPG_COLOUR_HAS_ALPHA, 0) != 0);
     data.SetColour(val.m_colour);
     for ( int i = 0; i < 16; i++ )
     {