diff --git a/include/connection.h b/include/connection.h
index b08e70e..aeb839b 100644
--- a/include/connection.h
+++ b/include/connection.h
@@ -105,11 +105,11 @@ namespace rest_rpc {
                                                          boost::asio::ssl::context_base::password_purpose purpose) {return "123456"; });
 
                     boost::system::error_code ec;
-                    if (fs::exists(ssl_conf.cert_file, ec)) {
+                    if (rpcfs::exists(ssl_conf.cert_file, ec)) {
                         ssl_context.use_certificate_chain_file(ssl_conf.cert_file);
                     }
 
-                    if (fs::exists(ssl_conf.key_file, ec))
+                    if (rpcfs::exists(ssl_conf.key_file, ec))
                         ssl_context.use_private_key_file(ssl_conf.key_file, boost::asio::ssl::context::pem);
 
                     //ssl_context_callback(ssl_context);
diff --git a/include/use_asio.hpp b/include/use_asio.hpp
index c7b5028..3495274 100644
--- a/include/use_asio.hpp
+++ b/include/use_asio.hpp
@@ -49,16 +49,16 @@ using string_view = boost::string_view;
 #if defined (__GNUC__)
 #if __GNUC__ < 8
 #include <experimental/filesystem>
-namespace fs = std::experimental::filesystem;
+namespace rpcfs = std::experimental::filesystem;
 #else
 #include <filesystem>
-namespace fs = std::filesystem;
+namespace rpcfs = std::filesystem;
 #endif
 #else
 #include <boost/filesystem.hpp>
-namespace fs = boost::filesystem;
+namespace rpcfs = boost::filesystem;
 #endif
 #else
 #include <boost/filesystem.hpp>
-namespace fs = boost::filesystem;
+namespace rpcfs = boost::filesystem;
 #endif