diff --git a/Doxyfile.in b/Doxyfile.in
index 84d5bfc4..37543d46 100644
--- a/Doxyfile.in
+++ b/Doxyfile.in
@@ -2204,7 +2204,7 @@ 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           =
 
 # The DOT_FONTSIZE tag can be used to set the size (in points) of the font of
 # dot graphs.