diff --git a/python/spot/__init__.py b/python/spot/__init__.py
index a3f0c3b57..faa50d30e 100644
--- a/python/spot/__init__.py
+++ b/python/spot/__init__.py
@@ -86,7 +86,7 @@ def setup(**kwargs):
     import os
 
     s = ('size="{}" edge[arrowhead=vee, arrowsize=.7]')
-    os.environ['SPOT_DOTEXTRA'] = s.format(kwargs.get('size', '10.2,5'))
+    os.environ['SPOT_DOTEXTRA'] = s.format(kwargs.get('size', '10.13,5'))
 
     bullets = 'B' if kwargs.get('bullets', True) else ''
     max_states = '<' + str(kwargs.get('max_states', 50))
diff --git a/tests/python/automata-io.ipynb b/tests/python/automata-io.ipynb
index 6d364a678..24fcda286 100644
--- a/tests/python/automata-io.ipynb
+++ b/tests/python/automata-io.ipynb
@@ -68,7 +68,7 @@
       "  fontname=\"Lato\"\n",
       "  node [fontname=\"Lato\"]\n",
       "  edge [fontname=\"Lato\"]\n",
-      "  size=\"10.2,5\" edge[arrowhead=vee, arrowsize=.7]\n",
+      "  size=\"10.13,5\" edge[arrowhead=vee, arrowsize=.7]\n",
       "  I [label=\"\", style=invis, width=0]\n",
       "  I -> 1\n",
       "  0 [label=<0>, peripheries=2]\n",