diff --git a/test/compat/render-chunked.test.js b/test/compat/render-chunked.test.js
index 9d8a0c0e..db7d3d7c 100644
--- a/test/compat/render-chunked.test.js
+++ b/test/compat/render-chunked.test.js
@@ -32,10 +32,10 @@ describe('renderToChunks', () => {
 		await promise;
 
 		expect(result).to.deep.equal([
-			'<div><!--preact-island:00-->loading...<!--/preact-island:00--></div>',
+			'<div><!--preact-island:6-->loading...<!--/preact-island:6--></div>',
 			'<div hidden>',
 			createInitScript(),
-			createSubtree('00', '<p>it works</p>'),
+			createSubtree('6', '<p>it works</p>'),
 			'</div>'
 		]);
 	});
@@ -60,7 +60,7 @@ describe('renderToChunks', () => {
 		suspended.resolve();
 
 		expect(result).to.deep.equal([
-			'<div><!--preact-island:00-->loading...<!--/preact-island:00--></div>',
+			'<div><!--preact-island:12-->loading...<!--/preact-island:12--></div>',
 			'<div hidden>',
 			createInitScript(1),
 			'</div>'
diff --git a/test/compat/stream-node.test.js b/test/compat/stream-node.test.js
index a2079cb4..bd3b0c55 100644
--- a/test/compat/stream-node.test.js
+++ b/test/compat/stream-node.test.js
@@ -66,10 +66,10 @@ describe('renderToPipeableStream', () => {
 		const result = await sink.promise;
 
 		expect(result).to.deep.equal([
-			'<div><!--preact-island:00-->loading...<!--/preact-island:00--></div>',
+			'<div><!--preact-island:19-->loading...<!--/preact-island:19--></div>',
 			'<div hidden>',
 			createInitScript(),
-			createSubtree('00', '<p>it works</p>'),
+			createSubtree('19', '<p>it works</p>'),
 			'</div>'
 		]);
 	});
diff --git a/test/compat/stream.test.js b/test/compat/stream.test.js
index 48f91617..5ac6cfd5 100644
--- a/test/compat/stream.test.js
+++ b/test/compat/stream.test.js
@@ -82,10 +82,10 @@ describe('renderToReadableStream', () => {
 		const result = await sink.promise;
 
 		expect(result).to.deep.equal([
-			'<div><!--preact-island:00-->loading...<!--/preact-island:00--></div>',
+			'<div><!--preact-island:27-->loading...<!--/preact-island:27--></div>',
 			'<div hidden>',
 			createInitScript(),
-			createSubtree('00', '<p>it works</p>'),
+			createSubtree('27', '<p>it works</p>'),
 			'</div>'
 		]);
 	});