diff --git a/examples/wsperf/request.cpp b/examples/wsperf/request.cpp
index d24bbe1536..55e330488a 100644
--- a/examples/wsperf/request.cpp
+++ b/examples/wsperf/request.cpp
@@ -126,7 +126,7 @@ void request::process(unsigned int id) {
                 }
                 
                 
-                sleep(1);
+                boost::this_thread::sleep(boost::posix_time::milliseconds(1000));
             }
             e.end_perpetual();
             t.join();
diff --git a/src/common.hpp b/src/common.hpp
index 1115465c77..6dfd51e9a1 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -41,7 +41,9 @@
 #endif
 
 #ifdef _MSC_VER
-    #define _WEBSOCKETPP_CPP11_FRIEND_
+    #ifndef _WEBSOCKETPP_CPP11_FRIEND_
+        #define _WEBSOCKETPP_CPP11_FRIEND_
+    #endif
 #endif
 
 #include <exception>