diff --git a/aos/ipc_lib/index.h b/aos/ipc_lib/index.h
index 75f1e9b..c4cc64a 100644
--- a/aos/ipc_lib/index.h
+++ b/aos/ipc_lib/index.h
@@ -2,10 +2,8 @@
 #define AOS_IPC_LIB_INDEX_H_
 
 #include <stdint.h>
-#include <sys/types.h>
 
-#include <atomic>
-#include <string>
+#include <limits>
 
 #include "glog/logging.h"
 
@@ -25,10 +23,6 @@
 
 namespace aos::ipc_lib {
 
-struct AtomicQueueIndex;
-class AtomicIndex;
-class Index;
-
 namespace testing {
 class QueueIndexTest;
 }  // namespace testing