diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index b75b13b2d03f6b7e6873b1cc72b7d5cca893bd02..94b3d6de02f0f773e0ff1a255ea92fafb48f7c4e 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -2069,7 +2069,7 @@ DOT_NUM_THREADS        = 0
 # The default value is: Helvetica.
 # This tag requires that the tag HAVE_DOT is set to YES.
 
-DOT_FONTNAME           = FreeSans
+DOT_FONTNAME           = Helvetica
 
 # The DOT_FONTSIZE tag can be used to set the size (in points) of the font of
 # dot graphs.