diff --git a/include/wx/dc.h b/include/wx/dc.h
index dbe62c4d95..da5bc5fde0 100644
--- a/include/wx/dc.h
+++ b/include/wx/dc.h
@@ -446,7 +446,7 @@ public:
                                         wxCoord *width,
                                         wxCoord *height,
                                         wxCoord *heightLine = NULL,
-                                        wxFont *font = NULL);
+                                        wxFont *font = NULL) const;
 
     // Measure cumulative width of text after each character
     bool GetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
diff --git a/src/common/dcbase.cpp b/src/common/dcbase.cpp
index 52359ee586..4df3396d2c 100644
--- a/src/common/dcbase.cpp
+++ b/src/common/dcbase.cpp
@@ -471,7 +471,7 @@ void wxDCBase::GetMultiLineTextExtent(const wxString& text,
                                       wxCoord *x,
                                       wxCoord *y,
                                       wxCoord *h,
-                                      wxFont *font)
+                                      wxFont *font) const
 {
     wxCoord widthTextMax = 0, widthLine,
             heightTextTotal = 0, heightLineDefault = 0, heightLine = 0;