diff --git a/Doc/doxy.config.in b/Doc/doxy.config.in
index 4dafd816..4cc0860c 100644
--- a/Doc/doxy.config.in
+++ b/Doc/doxy.config.in
@@ -1731,7 +1731,7 @@ DOT_NUM_THREADS        = 0
 # the DOTFONTPATH environment variable or by setting DOT_FONTPATH to the
 # directory containing the font.
 
-DOT_FONTNAME           = FreeSans
+DOT_FONTNAME           = Helvetica
 
 # The DOT_FONTSIZE tag can be used to set the size of the font of dot graphs.
 # The default size is 10pt.