diff --git a/src/org/redkale/source/CacheMemorySource.java b/src/org/redkale/source/CacheMemorySource.java
index 4daa4819a..f18162ae3 100644
--- a/src/org/redkale/source/CacheMemorySource.java
+++ b/src/org/redkale/source/CacheMemorySource.java
@@ -1339,7 +1339,7 @@ public final class CacheMemorySource<V extends Object> extends AbstractService i
     }
 
     @Override
-    public long spopLongSetItem(final String key) {
+    public Long spopLongSetItem(final String key) {
         return (Long) spopSetItem(key, long.class);
     }
 
diff --git a/src/org/redkale/source/CacheSource.java b/src/org/redkale/source/CacheSource.java
index 6551b08ec..89b58fbe1 100644
--- a/src/org/redkale/source/CacheSource.java
+++ b/src/org/redkale/source/CacheSource.java
@@ -240,7 +240,7 @@ public interface CacheSource<V extends Object> {
 
     public void appendLongListItem(final String key, final long value);
 
-    public long spopLongSetItem(final String key);
+    public Long spopLongSetItem(final String key);
 
     public List<Long> spopLongSetItem(final String key, final int count);