diff --git a/hutool-core/src/test/java/cn/hutool/core/stream/AbstractEnhancedWrappedStreamTest.java b/hutool-core/src/test/java/cn/hutool/core/stream/AbstractEnhancedWrappedStreamTest.java
index 73169ef77..88db081cb 100644
--- a/hutool-core/src/test/java/cn/hutool/core/stream/AbstractEnhancedWrappedStreamTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/stream/AbstractEnhancedWrappedStreamTest.java
@@ -628,7 +628,9 @@ public class AbstractEnhancedWrappedStreamTest {
 
 	@Test
 	public void testToEntries() {
-		final Map<Integer, Integer> expect = new HashMap<Integer, Integer>() {{
+		final Map<Integer, Integer> expect = new HashMap<Integer, Integer>() {
+			private static final long serialVersionUID = 1L;
+			{
 			put(1, 1);
 			put(2, 2);
 			put(3, 3);