diff --git a/wrap/python/tests/ipnbdoctest.py b/wrap/python/tests/ipnbdoctest.py
index 4b14f4400..bce5e3fa3 100755
--- a/wrap/python/tests/ipnbdoctest.py
+++ b/wrap/python/tests/ipnbdoctest.py
@@ -67,6 +67,13 @@ def sanitize(s):
     # normalize UUIDs:
     s = re.sub(r'[a-f0-9]{8}(\-[a-f0-9]{4}){3}\-[a-f0-9]{12}', 'U-U-I-D', s)
 
+    # SVG generated by graphviz may put note at different positions
+    # depending on the graphviz build.  Let's just strip anything that
+    # look like a position.
+    s = re.sub(r'<path d="[^"]*"', '<path', s)
+    s = re.sub(r'x="[0-9.]+"', 'x=""', s)
+    s = re.sub(r'y="[0-9.]+"', 'y=""', s)
+
     return s