diff --git a/src/cocoa/brush.mm b/src/cocoa/brush.mm
index de0760c16a..eef0553a90 100644
--- a/src/cocoa/brush.mm
+++ b/src/cocoa/brush.mm
@@ -96,7 +96,7 @@ bool wxBrushRefData::operator==(const wxBrushRefData& data) const
     // don't compare our NSColor
     return m_style == data.m_style &&
            m_colour == data.m_colour &&
-           m_stipple == data.m_stipple;
+           m_stipple.IsSameAs(data.m_stipple);
 }
 
 void wxBrushRefData::DoSetStipple(const wxBitmap& stipple)