diff --git a/lib/src/main/java/org/automerge/PatchAction.java b/lib/src/main/java/org/automerge/PatchAction.java
index d29aae4..3607ddc 100644
--- a/lib/src/main/java/org/automerge/PatchAction.java
+++ b/lib/src/main/java/org/automerge/PatchAction.java
@@ -239,7 +239,7 @@ public org.automerge.Mark[] getMarks() {
 	}
 
 	/** A property which was already in the document is now conflicted */
-	public static class FlagConflict {
+	public static class FlagConflict extends PatchAction {
 		private final Prop property;
 
 		protected FlagConflict(Prop property) {
diff --git a/lib/src/test/java/org/automerge/TestPatches.java b/lib/src/test/java/org/automerge/TestPatches.java
index f365438..75f938f 100644
--- a/lib/src/test/java/org/automerge/TestPatches.java
+++ b/lib/src/test/java/org/automerge/TestPatches.java
@@ -246,7 +246,7 @@ public void testSpliceText() {
 	}
 
 	@Test
-	public void testFlagConflictMap() {
+	public void testConflictedPutInMap() {
 		Document doc1 = new Document("bbbb".getBytes());
 		Document doc2 = new Document("aaaa".getBytes());
 		try (Transaction tx = doc1.startTransaction()) {
@@ -271,7 +271,31 @@ public void testFlagConflictMap() {
 	}
 
 	@Test
-	public void testFlagConflictList() {
+	public void testFlagConflictMap() {
+		Document doc1 = new Document("bbbb".getBytes());
+		Document doc2 = new Document("aaaa".getBytes());
+		try (Transaction tx = doc1.startTransaction()) {
+			tx.set(ObjectId.ROOT, "key", "value_1");
+			tx.commit();
+		}
+		try (Transaction tx = doc2.startTransaction()) {
+			tx.set(ObjectId.ROOT, "key", "value_2");
+			tx.commit();
+		}
+		PatchLog patchLog = new PatchLog();
+		doc1.merge(doc2, patchLog);
+		List<Patch> patches = doc1.makePatches(patchLog);
+
+		Assertions.assertEquals(patches.size(), 1);
+		Patch patch = patches.get(0);
+		Assertions.assertEquals(patch.getObj(), ObjectId.ROOT);
+		Assertions.assertEquals(patch.getPath(), emptyPath());
+
+		PatchAction.FlagConflict action = (PatchAction.FlagConflict) patch.getAction();
+	}
+
+	@Test
+	public void testConflictedPutInList() {
 		Document doc1 = new Document("bbbb".getBytes());
 		ObjectId list;
 		try (Transaction tx = doc1.startTransaction()) {
@@ -303,6 +327,38 @@ public void testFlagConflictList() {
 		Assertions.assertTrue(action.isConflict());
 	}
 
+	@Test
+	public void testFlagConflictList() {
+		Document doc1 = new Document("bbbb".getBytes());
+		ObjectId list;
+		try (Transaction tx = doc1.startTransaction()) {
+			list = tx.set(ObjectId.ROOT, "list", ObjectType.LIST);
+			tx.insert(list, 0, NewValue.NULL);
+			tx.commit();
+		}
+
+		Document doc2 = doc1.fork("aaaa".getBytes());
+		try (Transaction tx = doc1.startTransaction()) {
+			tx.set(list, 0, "value_2");
+			tx.commit();
+		}
+		try (Transaction tx = doc2.startTransaction()) {
+			tx.set(list, 0, "value_1");
+			tx.commit();
+		}
+
+		PatchLog patchLog = new PatchLog();
+		doc1.merge(doc2, patchLog);
+		List<Patch> patches = doc1.makePatches(patchLog);
+
+		Assertions.assertEquals(patches.size(), 1);
+		Patch patch = patches.get(0);
+		Assertions.assertEquals(patch.getObj(), list);
+		Assertions.assertEquals(patch.getPath(), PathBuilder.root("list").build());
+
+		PatchAction.FlagConflict action = (PatchAction.FlagConflict) patch.getAction();
+	}
+
 	@Test
 	public void testIncrementInMap() {
 		Document doc = new Document();
diff --git a/rust/src/patches.rs b/rust/src/patches.rs
index 581821e..815bdbb 100644
--- a/rust/src/patches.rs
+++ b/rust/src/patches.rs
@@ -117,8 +117,8 @@ fn to_jni_patch<'a>(
             let jprop = prop_to_java(env, &prop)?;
             env.new_object(
                 FLAG_CONFLICT_CLASS,
-                format!("(L{PROP_CLASS};J)V"),
-                &[(&jprop).into(), 0.into()],
+                format!("(L{PROP_CLASS};)V"),
+                &[(&jprop).into()],
             )?
         }
     };