diff --git a/include/cppshell/shell.hpp b/include/cppshell/shell.hpp
index 0ebdb17..a6ec195 100644
--- a/include/cppshell/shell.hpp
+++ b/include/cppshell/shell.hpp
@@ -10,7 +10,7 @@
 namespace cppshell {
 class Shell {
  public:
-  Shell(const std::string& shell = "bash");
+  Shell(const std::string& shell = "bash", const std::string& path_to_tmp_directory = "/tmp");
 
   void Execute(const std::string& command);
 
@@ -21,11 +21,9 @@ class Shell {
   }
 
  private:
-  void ExecuteImpl(const std::string& command, bool need_ignore_sigpipe);
-
   void Destroy();
 
-  void MakeUniqueDirectory();
+  void MakeUniqueDirectory(const std::string& path_to_tmp_directory);
   void MakeFifoFile();
 
  private:
diff --git a/src/shell.cpp b/src/shell.cpp
index 8fddfc3..5c531aa 100644
--- a/src/shell.cpp
+++ b/src/shell.cpp
@@ -15,8 +15,8 @@
 #include <stdexcept>
 
 namespace cppshell {
-Shell::Shell(const std::string& shell) {
-  MakeUniqueDirectory();
+Shell::Shell(const std::string& shell, const std::string& path_to_tmp_directory) {
+  MakeUniqueDirectory(path_to_tmp_directory);
   MakeFifoFile();
 
   int fds_exit_codes[2];
@@ -41,8 +41,8 @@ Shell::Shell(const std::string& shell) {
   }
 }
 
-void Shell::MakeUniqueDirectory() {
-  unique_directory_ = "/tmp/cppshell_XXXXXX";
+void Shell::MakeUniqueDirectory(const std::string& path_to_tmp_directory) {
+  unique_directory_ = path_to_tmp_directory + "/cppshell_XXXXXX";
   if (mkdtemp(const_cast<char*>(unique_directory_.data())) == nullptr) {
     throw std::logic_error("make unique directory failed");
   }