diff --git a/python/sglang/srt/mem_cache/radix_cache.py b/python/sglang/srt/mem_cache/radix_cache.py
index 40e8bee43..f06ab7803 100644
--- a/python/sglang/srt/mem_cache/radix_cache.py
+++ b/python/sglang/srt/mem_cache/radix_cache.py
@@ -665,6 +665,7 @@ class RadixCache(BasePrefixCache):
             self.evictable_size_ -= len(node.key)
             self.protected_size_ += len(node.key)
         node.lock_ref += 1
+        self._update_leaf_status(node)
 
     def dec_node_lock_ref(self, node: TreeNode):
         """Decrement lock_ref on a single node without walking to root.
@@ -679,6 +680,7 @@ class RadixCache(BasePrefixCache):
             self.evictable_size_ += len(node.key)
             self.protected_size_ -= len(node.key)
         node.lock_ref -= 1
+        self._update_leaf_status(node)
 
     def evictable_size(self):
         return self.evictable_size_