diff --git a/Device/IO/IOFactory.cpp b/Device/IO/IOFactory.cpp
index 69639d87811ede355f507015c478b57cb33b4602..43a7bce60206b3d9db25da334f91f3f565c25614 100644
--- a/Device/IO/IOFactory.cpp
+++ b/Device/IO/IOFactory.cpp
@@ -114,8 +114,6 @@ std::stringstream file2stream(const std::string& fname)
 
 void stream2file(const std::string& fname, std::stringstream& s)
 {
-    using namespace Util::Parse;
-
     std::ofstream fout;
     std::ios_base::openmode openmode = std::ios::out;
     if (is_binary2D(fname))