diff --git a/tools/modelGraph.php b/tools/modelGraph.php
index 0a8f084..80db3d1 100755
--- a/tools/modelGraph.php
+++ b/tools/modelGraph.php
@@ -46,7 +46,10 @@ class modelgraph
       $tables[$table] = $this->db->getTableSchema ($table);
     }
     $d = "digraph G {\n";
-    $d .= "  node [shape=box];\n";
+    $d .= "  node [\n";
+    $d .= "    shape=box\n";
+    $d .= "    fontname = \"helvetica\"\n";
+    $d .= "  ];\n";
     $d .= "  rankdir=RL\n";
 
     // Generate the tables objects with the fields