diff --git a/python/sglang/srt/mem_cache/memory_pool.py b/python/sglang/srt/mem_cache/memory_pool.py
index a882f7451..e425c7927 100644
--- a/python/sglang/srt/mem_cache/memory_pool.py
+++ b/python/sglang/srt/mem_cache/memory_pool.py
@@ -190,7 +190,7 @@ class TokenToKVPoolAllocator:
         self.free_slots = torch.arange(
             1, self.size + 1, dtype=torch.int64, device=self.device
         )
-        self.is_in_free_group = False
+        self.is_not_in_free_group = True
         self.free_group = []
 
 
diff --git a/python/sglang/srt/mem_cache/paged_allocator.py b/python/sglang/srt/mem_cache/paged_allocator.py
index 76c74d069..6b7402e06 100644
--- a/python/sglang/srt/mem_cache/paged_allocator.py
+++ b/python/sglang/srt/mem_cache/paged_allocator.py
@@ -279,5 +279,5 @@ class PagedTokenToKVPoolAllocator:
         self.free_pages = torch.arange(
             1, self.num_pages + 1, dtype=torch.int64, device=self.device
         )
-        self.is_in_free_group = False
+        self.is_not_in_free_group = True
         self.free_group = []