diff --git a/include/callstack.h b/include/callstack.h
index 0bcb6ba79c4c99fd43d82efce962a20794315ccd..c401fd488b1ef9e481ec90993524b2bc8383c0ca 100644
--- a/include/callstack.h
+++ b/include/callstack.h
@@ -53,7 +53,6 @@ public:
     size_t ExpandCallStack(pid_t tid, std::vector<DfxFrame> &callFrames, size_t expandLimit = 1u);
 
 private:
-    mutable std::mutex cacheMutex_;
     pid_t lastPid_ = -1;
     ADDR_TYPE lastAddr_ = 0;
     ADDR_TYPE lastData_ = 0;
diff --git a/src/callstack.cpp b/src/callstack.cpp
index 7b9ee4b0d7f667287f46f3bc0d5c3f45bdcd6af4..cbe9f1969f843d2bba6bebd061db1338e5e22a7e 100644
--- a/src/callstack.cpp
+++ b/src/callstack.cpp
@@ -215,8 +215,6 @@ size_t CallStack::ExpandCallStack(pid_t tid, std::vector<DfxFrame> &callFrames,
         HLOGM("new callstack is too small, skip it");
         return expand;
     }
-
-    std::lock_guard<std::mutex> lock(cacheMutex_);
     if (!cachedCallFramesMap_.count(tid)) {
         cachedCallFramesMap_[tid].reserve(MAX_CALL_FRAME_EXPAND_CACHE_SIZE);
     }
@@ -437,7 +435,6 @@ CallStack::CallStack()
 
 void CallStack::ClearCache()
 {
-    std::lock_guard<std::mutex> lock(cacheMutex_);
     cachedCallFramesMap_.clear();
     lastPid_ = -1;
     lastAddr_ = 0;