1 files changed, 1 insertions, 1 deletions
diff --git a/graph.py b/graph.py
index d62e8c0..9a77495 100644
--- a/graph.py
+++ b/graph.py
@@ -63,7 +63,7 @@ class DotBackend:
             assert charset.lower() in ('utf-8', 'iso-8859-1', 'latin1'), \
                    'unsupported charset %s' % charset
             self.emit('charset="%s"' % charset)
-        for param in additionnal_param.iteritems():
+        for param in sorted(additionnal_param.iteritems()):
             self.emit('='.join(param))
 
     def get_source(self):