diff --git a/core-buffer/src/BinaryWriter.cpp b/core-buffer/src/BinaryWriter.cpp
index ab6a9b7..4adcb37 100644
--- a/core-buffer/src/BinaryWriter.cpp
+++ b/core-buffer/src/BinaryWriter.cpp
@@ -89,7 +89,8 @@ void BinaryWriter::open_file(const std::string& filename)
 
     WriterUtils::create_destination_folder(filename);
 
-    output_file_fd_ = ::open(filename.c_str(), O_WRONLY | O_CREAT | O_DSYNC);
+    output_file_fd_ = ::open(filename.c_str(), O_WRONLY | O_CREAT | O_DSYNC,
+                             S_IRWXU | S_IWUSR | S_IRGRP | S_IWGRP);
     if (output_file_fd_ < 0) {
         stringstream err_msg;