diff --git a/include/grpc++/impl/sync.h b/include/grpc++/impl/sync.h
index 64d1003685ef1025d342604f61cd660c26f1a4c2..2f41d2bdebb8b73c0fa3137ceaf650370393bead 100644
--- a/include/grpc++/impl/sync.h
+++ b/include/grpc++/impl/sync.h
@@ -37,10 +37,9 @@
 #include <grpc++/config.h>
 
 #ifdef GRPC_CXX0X_NO_THREAD
-#include <grpc++/impl/sync_nocxx11.h>
+#include <grpc++/impl/sync_no_cxx11.h>
 #else
 #include <grpc++/impl/sync_cxx11.h>
-
 #endif
 
 #endif  // GRPCXX_IMPL_SYNC_H
diff --git a/include/grpc++/impl/sync_no_cxx11.h b/include/grpc++/impl/sync_no_cxx11.h
index 3bf4fb8e3d327b4f611461d27a8fd11481d0cbe2..5636373b8141638204ffbb19d30c9f2a3d02fa80 100644
--- a/include/grpc++/impl/sync_no_cxx11.h
+++ b/include/grpc++/impl/sync_no_cxx11.h
@@ -56,13 +56,14 @@ class mutex {
 template <class mutex>
 class lock_guard {
  public:
-   lock_guard(mutex &mu) : mu_(mu), locked(true) { gpr_mu_lock(&mu.mu_); }
-   ~lock_guard() { unlock(); }
-  void lock() {
+  lock_guard(mutex &mu) : mu_(mu), locked(true) { gpr_mu_lock(&mu.mu_); }
+  ~lock_guard() { unlock_internal(); }
+ protected:
+  void lock_internal() {
     if (!locked) gpr_mu_lock(&mu_.mu_);
     locked = true;
   }
-  void unlock() {
+  void unlock_internal() {
     if (locked) gpr_mu_unlock(&mu_.mu_);
     locked = false;
   }
@@ -75,7 +76,9 @@ class lock_guard {
 template <class mutex>
 class unique_lock : public lock_guard<mutex> {
  public:
-   unique_lock(mutex &mu) : lock_guard(mu) { }
+  unique_lock(mutex &mu) : lock_guard(mu) { }
+  void lock() { lock_internal(); }
+  void unlock() { unlock_internal(); }
 };
 
 class condition_variable {
diff --git a/include/grpc++/impl/thd.h b/include/grpc++/impl/thd.h
index 6a4c86a490377d60f4ffae46684a45e18b8b1680..4c4578a92da142bfaef648b4b4cb1d69aaa58add 100644
--- a/include/grpc++/impl/thd.h
+++ b/include/grpc++/impl/thd.h
@@ -37,10 +37,9 @@
 #include <grpc++/config.h>
 
 #ifdef GRPC_CXX0X_NO_THREAD
-#include <grpc++/impl/thd_nocxx11.h>
+#include <grpc++/impl/thd_no_cxx11.h>
 #else
 #include <grpc++/impl/thd_cxx11.h>
-
 #endif
 
 #endif  // GRPCXX_IMPL_THD_H
diff --git a/include/grpc++/impl/thd_no_cxx11.h b/include/grpc++/impl/thd_no_cxx11.h
index f54cc1b6dee804ad3f3f79b7f3acf7f10b40ba0d..a01b931df86f6de027ecd111c474b25ab6a5e5ad 100644
--- a/include/grpc++/impl/thd_no_cxx11.h
+++ b/include/grpc++/impl/thd_no_cxx11.h
@@ -42,15 +42,22 @@ class thread {
  public:
   template<class T> thread(void (T::*fptr)(), T *obj) {
     func_ = new thread_function<T>(fptr, obj);
+    joined_ = false;
     start();
   }
-  ~thread() { delete func_; }
-  void join() { gpr_thd_join(thd); }
+  ~thread() {
+    if (!joined_) std::terminate();
+    delete func_;
+  }
+  void join() {
+    gpr_thd_join(thd_);
+    joined_ = true;
+  }
  private:
   void start() {
     gpr_thd_options options = gpr_thd_options_default();
     gpr_thd_options_set_joinable(&options);
-    gpr_thd_new(&thd, thread_func, (void *) func_, &options);
+    gpr_thd_new(&thd_, thread_func, (void *) func_, &options);
   }
   static void thread_func(void *arg) {
     thread_function_base *func = (thread_function_base *) arg;
@@ -73,7 +80,8 @@ class thread {
     T *obj_;
   };
   thread_function_base *func_;
-  gpr_thd_id thd;
+  gpr_thd_id thd_;
+  bool joined_;
 };
 
 }  // namespace grpc