diff --git a/test_conflict_set.py b/test_conflict_set.py
index 23d79de..383f17f 100644
--- a/test_conflict_set.py
+++ b/test_conflict_set.py
@@ -56,7 +56,7 @@ def test_conflict_set():
         assert cs.check(read(0, key), read(1, key)) == [Result.TOO_OLD, Result.COMMIT]
 
 
-def test_update_zero():
+def test_update_zero_should_commit():
     with DebugConflictSet() as cs1:
         with DebugConflictSet() as cs2:
             cs1.addWrites(2, write(b""))
@@ -70,6 +70,20 @@ def test_update_zero():
             cs2.check(read(0, b"\x00", bytes([256 - 17])))
 
 
+def test_update_zero_should_conflict():
+    with DebugConflictSet() as cs1:
+        with DebugConflictSet() as cs2:
+            cs1.addWrites(2**32)
+            cs1.setOldestVersion(2**32)
+            cs2.addWrites(2**31 + 100)
+            cs2.setOldestVersion(2**31 + 100)
+            # "zero" is now 2**31 + 100
+            cs1.addWrites(2**32 + 101, write(b"", b"\x02"), write(b"\x01"))
+            # rangeVersion of \x01 is now 2**31 + 100 ("max" of (2**31 + 100, 2**32 + 101))
+            cs1.check(read(2**32 + 1, b"\x00"))
+            # but 2**32 + 1 ">" 2**31 + 100 , and it incorrectly commits
+
+
 def test_inner_full_words():
     with DebugConflictSet() as cs:
         cs.addWrites(1, write(b"\x3f\x61"), write(b"\x81\x61"))