diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1deb880..32601c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -208,6 +208,18 @@ if(BUILD_TESTING)
     target_link_libraries(expected_eval_errors_test ${LIBS})
     add_test(NAME Expected_Eval_Errors_Test COMMAND expected_eval_errors_test)
 
+    if (MULTITHREAD_SUPPORT_ENABLED)
+      add_executable(multithreaded_test unittests/multithreaded_test.cpp)
+      target_link_libraries(multithreaded_test ${LIBS})
+      add_test(NAME Multithreaded_Test COMMAND multithreaded_test)
+      set_property(TEST Multithreaded_Test
+        PROPERTY ENVIRONMENT
+        "CHAI_USE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/unittests/"
+        "CHAI_MODULE_PATH=${CMAKE_CURRENT_BINARY_DIR}/"
+        )
+
+    endif()
+
 
     add_executable(multifile_test unittests/multifile_test_main.cpp unittests/multifile_test_chai.cpp
       unittests/multifile_test_module.cpp)
diff --git a/src/multithreaded.cpp b/src/multithreaded.cpp
deleted file mode 100644
index 2a540b8..0000000
--- a/src/multithreaded.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-// This file is distributed under the BSD License.
-// See "license.txt" for details.
-// Copyright 2009-2010, Jonathan Turner (jonathan@emptycrate.com)
-// and Jason Turner (jason@emptycrate.com)
-// http://www.chaiscript.com
-
-#include <iostream>
-
-#include <list>
-
-#include <chaiscript/chaiscript.hpp>
-#include <thread>
-
-
-
-
-void do_work(chaiscript::ChaiScript &c)
-{
-//  c("use(\"work.chai\"); do_chai_work(num_iterations);"); 
-  std::stringstream ss;
-  ss << "MyVar" << rand();
-  c.add(chaiscript::var(5), ss.str());
-  c("use(\"work.chai\"); do_chai_work(10000);");
-}
-
-int main(int argc, char *argv[]) {
-  std::string input;
-  chaiscript::ChaiScript chai;
-
-  //chai.add_shared_object(chaiscript::Boxed_Value(10000), "num_iterations");
-
-  std::vector<std::shared_ptr<std::thread> > threads;
-
-  for (int i = 0; i < argc - 1; ++i)
-  {
-//    std::thread t(&do_work, std::ref(chai));
-    threads.push_back(std::shared_ptr<std::thread>(new std::thread(&do_work, std::ref(chai))));
-  }
-
-  for (int i = 0; i < argc - 1; ++i)
-  {
-    threads[i]->join();
-  }
-}
-
diff --git a/src/work.chai b/src/work.chai
deleted file mode 100644
index c17470c..0000000
--- a/src/work.chai
+++ /dev/null
@@ -1,10 +0,0 @@
-def do_chai_work(num_iters)
-{
-  var i = 0;
-  for (var k = 0; k<num_iters * 10; ++k)
-  {
-    i += k;
-  }
-
-  print(i);
-}
diff --git a/unittests/multithreaded_test.cpp b/unittests/multithreaded_test.cpp
new file mode 100644
index 0000000..6edc5a1
--- /dev/null
+++ b/unittests/multithreaded_test.cpp
@@ -0,0 +1,99 @@
+// This file is distributed under the BSD License.
+// See "license.txt" for details.
+// Copyright 2009-2010, Jonathan Turner (jonathan@emptycrate.com)
+// and Jason Turner (jason@emptycrate.com)
+// http://www.chaiscript.com
+
+#include <iostream>
+
+#include <list>
+
+#include <chaiscript/chaiscript.hpp>
+
+int expected_value(int num_iters)
+{
+  int i = 0;
+  for (int k = 0; k<num_iters * 10; ++k)
+  {
+    i += k;
+  }
+
+  return i;
+}
+
+void do_work(chaiscript::ChaiScript &c, int id)
+{
+  std::stringstream ss;
+  ss << "MyVar" << rand();
+  c.add(chaiscript::var(5), ss.str());
+  ss.str("");
+  ss << id;
+  c.use("multithreaded_work.inc");
+  c("do_chai_work(4000, " + ss.str() + ");");
+}
+
+int main()
+{
+  // Disable deprecation warning for getenv call.
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable : 4996)
+#endif
+
+  const char *usepath = getenv("CHAI_USE_PATH");
+  const char *modulepath = getenv("CHAI_MODULE_PATH");
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+  std::vector<std::string> usepaths;
+  usepaths.push_back("");
+  if (usepath)
+  {
+    usepaths.push_back(usepath);
+  }
+
+  std::vector<std::string> modulepaths;
+  modulepaths.push_back("");
+  if (modulepath)
+  {
+    modulepaths.push_back(modulepath);
+  }
+
+  chaiscript::ChaiScript chai(modulepaths,usepaths);
+
+  std::vector<std::shared_ptr<std::thread> > threads;
+
+  // Ensure at least two, but say only 7 on an 8 core processor
+  int num_threads = std::max(std::thread::hardware_concurrency() - 1, 2u);
+
+  for (int i = 0; i < num_threads; ++i)
+  {
+    threads.push_back(std::shared_ptr<std::thread>(new std::thread(do_work, std::ref(chai), i)));
+  }
+
+  for (int i = 0; i < num_threads; ++i)
+  {
+    threads[i]->join();
+  }
+
+
+  for (int i = 0; i < num_threads; ++i)
+  {
+    std::stringstream ss;
+    ss << i;
+    if (chai.eval<int>("getvalue(" + ss.str() + ")") != expected_value(4000))
+    {
+      return EXIT_FAILURE;
+    }
+
+    if (chai.eval<int>("getid(" + ss.str() + ")") != i)
+    {
+      return EXIT_FAILURE;
+    }
+  }
+
+  return EXIT_SUCCESS;
+}
+
diff --git a/unittests/multithreaded_work.inc b/unittests/multithreaded_work.inc
new file mode 100644
index 0000000..7035423
--- /dev/null
+++ b/unittests/multithreaded_work.inc
@@ -0,0 +1,15 @@
+def do_chai_work(num_iters, id)
+{
+  var i = 0;
+  for (var k = 0; k<num_iters * 10; ++k)
+  {
+    if (k == 1000)
+    {
+      eval("def getid(id) : id == " + to_string(id) + " { return " + to_string(id) + "}");
+    }
+    i += k;
+  }
+
+  eval("def getvalue(id) : id == " + to_string(id) + " { return " + to_string(i) + "}");
+
+}