diff --git a/modules/cudaoptflow/src/nvidiaOpticalFlow.cpp b/modules/cudaoptflow/src/nvidiaOpticalFlow.cpp
index 7c1ef538a..4f0a14aaf 100644
--- a/modules/cudaoptflow/src/nvidiaOpticalFlow.cpp
+++ b/modules/cudaoptflow/src/nvidiaOpticalFlow.cpp
@@ -314,15 +314,11 @@ private:
 
     NV_OF_CUDA_API_FUNCTION_LIST* GetAPI()
     {
-        std::lock_guard<std::mutex> lock(m_lock);
         return  m_ofAPI.get();
     }
 
     NvOFHandle GetHandle() { return m_hOF; }
 
-protected:
-    std::mutex m_lock;
-
 public:
     NvidiaOpticalFlowImpl(cv::Size imageSize, NV_OF_PERF_LEVEL perfPreset, bool bEnableTemporalHints,
         bool bEnableExternalHints, bool bEnableCostBuffer, int gpuId, Stream inputStream, Stream outputStream);
@@ -767,15 +763,11 @@ private:
 
     NV_OF_CUDA_API_FUNCTION_LIST* GetAPI()
     {
-        std::lock_guard<std::mutex> lock(m_lock);
         return  m_ofAPI.get();
     }
 
     NvOFHandle GetHandle() { return m_hOF; }
 
-protected:
-    std::mutex m_lock;
-
 public:
     NvidiaOpticalFlowImpl_2(cv::Size imageSize, NV_OF_PERF_LEVEL perfPreset,
         NV_OF_OUTPUT_VECTOR_GRID_SIZE outputGridSize, NV_OF_HINT_VECTOR_GRID_SIZE hintGridSize,