diff --git a/osdk-core/modules/inc/filemgr/impl/mmap_file_buffer.hpp b/osdk-core/modules/inc/filemgr/impl/mmap_file_buffer.hpp
index 21ce9b739..9331b1079 100644
--- a/osdk-core/modules/inc/filemgr/impl/mmap_file_buffer.hpp
+++ b/osdk-core/modules/inc/filemgr/impl/mmap_file_buffer.hpp
@@ -12,27 +12,28 @@
 #include <unistd.h>
 #include <memory>
 #include <atomic>
+#include <string>
 
 namespace DJI {
 namespace OSDK {
-class MmapFileBuffer {
- public:
-  MmapFileBuffer();
-  ~MmapFileBuffer();
+        class MmapFileBuffer {
+            public:
+                MmapFileBuffer();
+                ~MmapFileBuffer();
 
-  std::string currentLogFilePath;
-  int fd;
-  char *fdAddr;
-  uint64_t fdAddrSize;
-  uint64_t curFilePos;
+                std::string currentLogFilePath;
+                int fd;
+                char *fdAddr;
+                uint64_t fdAddrSize;
+                uint64_t curFilePos;
 
-  bool init(std::string path, uint64_t fileSize);
+                bool init(std::string path, uint64_t fileSize);
 
-  bool deInit();
+                bool deInit();
 
-  bool InsertBlock(const uint8_t *pack, uint32_t data_length, uint64_t index);
+                bool InsertBlock(const uint8_t *pack, uint32_t data_length, uint64_t index);
 
-};
-}
+        };
+    }
 }
 #endif //ONBOARDSDK_INTERNAL_RESOURCES_SRC_OSDK_CORE_MODULES_INC_FILEMGR_IMPL_MMAP_FILE_BUFFER_HPP_