diff --git a/tfgraphviz/graphviz_wrapper.py b/tfgraphviz/graphviz_wrapper.py
index 3ddb5aa..08adf5e 100644
--- a/tfgraphviz/graphviz_wrapper.py
+++ b/tfgraphviz/graphviz_wrapper.py
@@ -153,7 +153,7 @@ def edge_label(shape):
     else: label = "%i" % shape[0]
     for s in shape[1:]:
         if s is None: label += "×?"
-        else: label += "×%i" % s
+        else: label += u"×%i" % s
     return label