diff --git a/sys/unix_handy.hpp b/sys/unix_handy.hpp
index faedefd51eaf6fb42d60d2fe6acbbeac2a537648..23b51994ca5d0213e901048ea180ff2588406ad2 100644
--- a/sys/unix_handy.hpp
+++ b/sys/unix_handy.hpp
@@ -11,9 +11,6 @@
 #error rlib/sys/unix_handy.hpp is not for Windows.
 #endif
 
-// For shell_run
-#include <sstream>
-
 namespace rlib {
     // args DOES NOT contain the "$0".
     inline void execs(std::string path, std::vector<std::string> args) {