diff --git a/toolsrc/include/vcpkg_System.h b/toolsrc/include/vcpkg_System.h
index 92ceacc88b..777f64bf4f 100644
--- a/toolsrc/include/vcpkg_System.h
+++ b/toolsrc/include/vcpkg_System.h
@@ -93,4 +93,6 @@ namespace vcpkg::System
     };
 
     std::wstring get_environmental_variable(const wchar_t* varname) noexcept;
+
+    void set_environmental_variable(const wchar_t* varname, const wchar_t* varvalue) noexcept;
 }
diff --git a/toolsrc/src/vcpkg_Environment.cpp b/toolsrc/src/vcpkg_Environment.cpp
index abde735cb5..7722136952 100644
--- a/toolsrc/src/vcpkg_Environment.cpp
+++ b/toolsrc/src/vcpkg_Environment.cpp
@@ -60,7 +60,7 @@ namespace vcpkg::Environment
                                                        System::get_environmental_variable(L"PATH"),
                                                        default_git_installation_dir.native(),
                                                        default_git_installation_dir_x86.native());
-        _wputenv_s(L"PATH", path_buf.c_str());
+        System::set_environmental_variable(L"PATH", path_buf.c_str());
 
         static constexpr std::array<int, 3> git_version = {2,0,0};
         static const std::wstring version_check_cmd = L"git --version 2>&1";
@@ -76,7 +76,7 @@ namespace vcpkg::Environment
                                                        System::get_environmental_variable(L"PATH"),
                                                        default_cmake_installation_dir.native(),
                                                        default_cmake_installation_dir_x86.native());
-        _wputenv_s(L"PATH", path_buf.c_str());
+        System::set_environmental_variable(L"PATH", path_buf.c_str());
 
         static constexpr std::array<int, 3> cmake_version = {3,7,2};
         static const std::wstring version_check_cmd = L"cmake --version 2>&1";
@@ -88,7 +88,7 @@ namespace vcpkg::Environment
     {
         const fs::path downloaded_nuget = paths.downloads / "nuget-3.5.0";
         const std::wstring path_buf = Strings::wformat(L"%s;%s", downloaded_nuget.native(), System::get_environmental_variable(L"PATH"));
-        _wputenv_s(L"PATH", path_buf.c_str());
+        System::set_environmental_variable(L"PATH", path_buf.c_str());
 
         static constexpr std::array<int, 3> nuget_version = {3,3,0};
         static const std::wstring version_check_cmd = L"nuget 2>&1";
diff --git a/toolsrc/src/vcpkg_System.cpp b/toolsrc/src/vcpkg_System.cpp
index 1d9f8e6966..e7349df692 100644
--- a/toolsrc/src/vcpkg_System.cpp
+++ b/toolsrc/src/vcpkg_System.cpp
@@ -29,7 +29,7 @@ namespace vcpkg::System
         auto pipe = _wpopen(actual_cmd_line.c_str(), L"r");
         if (pipe == nullptr)
         {
-            return {1, output};
+            return { 1, output };
         }
         while (fgets(buf, 1024, pipe))
         {
@@ -37,10 +37,10 @@ namespace vcpkg::System
         }
         if (!feof(pipe))
         {
-            return {1, output};
+            return { 1, output };
         }
         auto ec = _pclose(pipe);
-        return {ec, output};
+        return { ec, output };
     }
 
     void print(const char* message)
@@ -86,6 +86,11 @@ namespace vcpkg::System
         return ret;
     }
 
+    void set_environmental_variable(const wchar_t* varname, const wchar_t* varvalue) noexcept
+    {
+        _wputenv_s(varname, varvalue);
+    }
+
     void Stopwatch2::start()
     {
         static_assert(sizeof(start_time) == sizeof(LARGE_INTEGER), "");