diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/HashByteSet.java b/protocol/src/main/java/com/zfoo/protocol/collection/HashByteSet.java
index bfcfa40c..4d482770 100644
--- a/protocol/src/main/java/com/zfoo/protocol/collection/HashByteSet.java
+++ b/protocol/src/main/java/com/zfoo/protocol/collection/HashByteSet.java
@@ -87,6 +87,6 @@ public class HashByteSet extends AbstractSet<Byte> {
 
     @Override
     public int hashCode() {
-        return map.hashCode();
+        return Objects.hashCode(map);
     }
 }
diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/HashIntSet.java b/protocol/src/main/java/com/zfoo/protocol/collection/HashIntSet.java
index 3ff9f283..577f65c9 100644
--- a/protocol/src/main/java/com/zfoo/protocol/collection/HashIntSet.java
+++ b/protocol/src/main/java/com/zfoo/protocol/collection/HashIntSet.java
@@ -87,6 +87,6 @@ public class HashIntSet extends AbstractSet<Integer> {
 
     @Override
     public int hashCode() {
-        return map.hashCode();
+        return Objects.hashCode(map);
     }
 }
diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/HashLongSet.java b/protocol/src/main/java/com/zfoo/protocol/collection/HashLongSet.java
index 9afe93ce..37337a6b 100644
--- a/protocol/src/main/java/com/zfoo/protocol/collection/HashLongSet.java
+++ b/protocol/src/main/java/com/zfoo/protocol/collection/HashLongSet.java
@@ -87,6 +87,6 @@ public class HashLongSet extends AbstractSet<Long> {
 
     @Override
     public int hashCode() {
-        return map.hashCode();
+        return Objects.hashCode(map);
     }
 }
diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/HashShortSet.java b/protocol/src/main/java/com/zfoo/protocol/collection/HashShortSet.java
index d302567e..b25e4e75 100644
--- a/protocol/src/main/java/com/zfoo/protocol/collection/HashShortSet.java
+++ b/protocol/src/main/java/com/zfoo/protocol/collection/HashShortSet.java
@@ -87,6 +87,6 @@ public class HashShortSet extends AbstractSet<Short> {
 
     @Override
     public int hashCode() {
-        return map.hashCode();
+        return Objects.hashCode(map);
     }
 }