diff --git a/src/richtext/richtextbuffer.cpp b/src/richtext/richtextbuffer.cpp
index 2b4cad1d68..cc4f3de5bc 100644
--- a/src/richtext/richtextbuffer.cpp
+++ b/src/richtext/richtextbuffer.cpp
@@ -743,8 +743,9 @@ bool wxRichTextObject::DrawBorder(wxDC& dc, wxRichTextBuffer* buffer, const wxTe
                 penStyle = wxLONG_DASH;
             wxPen pen(col, 1, penStyle);
             dc.SetPen(pen);
-            dc.DrawLine(rect.x, rect.y, rect.x, rect.y + rect.height);
 
+            // Note that the last point is not drawn.
+            dc.DrawLine(rect.x, rect.y, rect.x, rect.y + rect.height);
         }
         else if (borderLeft > 1)
         {
@@ -772,8 +773,8 @@ bool wxRichTextObject::DrawBorder(wxDC& dc, wxRichTextBuffer* buffer, const wxTe
                 penStyle = wxLONG_DASH;
             wxPen pen(col, 1, penStyle);
             dc.SetPen(pen);
-            dc.DrawLine(rect.x + rect.width, rect.y, rect.x + rect.width, rect.y + rect.height + 1);
-
+            // Note that the last point is not drawn.
+            dc.DrawLine(rect.x + rect.width - 1, rect.y, rect.x + rect.width - 1, rect.y + rect.height);
         }
         else if (borderRight > 1)
         {
@@ -781,7 +782,7 @@ bool wxRichTextObject::DrawBorder(wxDC& dc, wxRichTextBuffer* buffer, const wxTe
             wxBrush brush(col);
             dc.SetPen(pen);
             dc.SetBrush(brush);
-            dc.DrawRectangle(rect.x + rect.width - borderRight, rect.y, borderRight, rect.height + 1);
+            dc.DrawRectangle(rect.x + rect.width - borderRight, rect.y, borderRight, rect.height);
         }
     }
 
@@ -829,8 +830,7 @@ bool wxRichTextObject::DrawBorder(wxDC& dc, wxRichTextBuffer* buffer, const wxTe
                 penStyle = wxLONG_DASH;
             wxPen pen(col, 1, penStyle);
             dc.SetPen(pen);
-            dc.DrawLine(rect.x, rect.y + rect.height, rect.x + rect.width, rect.y + rect.height);
-
+            dc.DrawLine(rect.x, rect.y + rect.height - 1, rect.x + rect.width, rect.y + rect.height - 1);
         }
         else if (borderBottom > 1)
         {
@@ -838,7 +838,7 @@ bool wxRichTextObject::DrawBorder(wxDC& dc, wxRichTextBuffer* buffer, const wxTe
             wxBrush brush(col);
             dc.SetPen(pen);
             dc.SetBrush(brush);
-            dc.DrawRectangle(rect.x, rect.y + rect.height - borderBottom + 1, rect.width, borderBottom);
+            dc.DrawRectangle(rect.x, rect.y + rect.height - borderBottom, rect.width, borderBottom);
         }
     }