diff --git a/test_conflict_set.py b/test_conflict_set.py
index 383f17f..6f90aea 100644
--- a/test_conflict_set.py
+++ b/test_conflict_set.py
@@ -154,6 +154,15 @@ def test_merge_child_node48():
         cs.addWrites(1, write(b"\x00" * 8, b"\x00" * 10))
 
 
+def test_fixup_256():
+    with DebugConflictSet() as cs:
+        cs.addWrites(0, write(bytes([1])))
+        for i in range(256):
+            cs.addWrites(1, write(bytes([1, i])))
+        cs.addWrites(2, write(bytes([0]), bytes([1])))
+        cs.check(read(0, bytes([1]), bytes([2])))
+
+
 if __name__ == "__main__":
     # budget "pytest" for ctest integration without pulling in a dependency. You can of course still use pytest in local development.
     import argparse