diff --git a/example/example.cpp b/example/example.cpp
index 6232d970..493cbc36 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -54,10 +54,10 @@ int main(int argc, char* argv[])
     using std::cout;
     using std::endl;
 
-    auto fsink2 = std::make_shared<sinks::rotating_file_sink>("log", "txt", 1024*1024*50 , 5, seconds(1));
+    //auto fsink2 = std::make_shared<sinks::rotating_file_sink>("log", "txt", 1024*1024*50 , 5, seconds(1));
     auto &logger2 = c11log::get_logger("logger2");
-    logger2.add_sink(fsink2);
-    //logger2.add_sink(std::make_shared<sinks::null_sink>());
+    //logger2.add_sink(fsink2);
+    logger2.add_sink(std::make_shared<sinks::null_sink>());
 
     auto start = system_clock::now();
     const unsigned int howmany = 10000000;
diff --git a/example/makefile b/example/makefile
index b102c8f4..330d3af0 100644
--- a/example/makefile
+++ b/example/makefile
@@ -1,4 +1,4 @@
-CXX	= ccache g++
+CXX	= g++
 CXXFLAGS	= -march=native -Wall -Wextra -Wshadow -pedantic -std=c++11 -pthread -I../include 
 CXX_RELEASE_FLAGS = -O3 -flto 
 CXX_DEBUG_FLAGS= -g 
diff --git a/include/c11log/details/blocking_queue.h b/include/c11log/details/blocking_queue.h
index cea541a2..94641a26 100644
--- a/include/c11log/details/blocking_queue.h
+++ b/include/c11log/details/blocking_queue.h
@@ -58,7 +58,8 @@ public:
     // If the queue is full, block the calling thread until there is room.
     template<typename TT>
     void push(TT&& item) {
-        while (!push(std::forward<TT>(item), _one_hour));
+		static constexpr std::chrono::hours one_hour(1);
+        while (!push(std::forward<TT>(item), one_hour));
     }
 
     // Pop a copy of the front item in the queue into the given item ref.
@@ -85,7 +86,8 @@ public:
     // Pop a copy of the front item in the queue into the given item ref.
     // If the queue is empty, block the calling thread util there is item to pop.
     void pop(T& item) {
-        while (!pop(item, _one_hour));
+		static constexpr std::chrono::hours one_hour(1);
+        while (!pop(item, one_hour));
     }
 
     // Clear the queue
@@ -103,7 +105,6 @@ private:
     std::mutex _mutex;
     std::condition_variable _item_pushed_cond;
     std::condition_variable _item_popped_cond;
-    static constexpr auto _one_hour = std::chrono::hours(1);
 };
 
 }
diff --git a/include/c11log/formatter.h b/include/c11log/formatter.h
index fa424293..004480b5 100644
--- a/include/c11log/formatter.h
+++ b/include/c11log/formatter.h
@@ -42,9 +42,7 @@ private:
 
 
 inline void c11log::formatters::default_formatter::_format_time(const log_clock::time_point& tp, std::ostream &dest)
-{
-    using namespace std::chrono;
-
+{    
     auto tm = details::os::localtime(log_clock::to_time_t(tp));
     char buff[64];
     int size = snprintf(buff, sizeof(buff), "[%d-%02d-%02d %02d:%02d:%02d]",