diff --git a/src/mutex.cpp b/src/mutex.cpp
index 3c735a6b..0cf11199 100644
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -199,7 +199,7 @@ void mutex::do_unlock()
     assert(res == 0);
 }
 
-void mutex::do_lock(cv_state& state)
+void mutex::do_lock(cv_state&)
 {
 }
 
@@ -248,7 +248,7 @@ void try_mutex::do_unlock()
     assert(res == 0);
 }
 
-void try_mutex::do_lock(cv_state& state)
+void try_mutex::do_lock(cv_state&)
 {
 }
 
@@ -367,7 +367,7 @@ void timed_mutex::do_unlock()
     assert(res == 0);
 }
 
-void timed_mutex::do_lock(cv_state& state)
+void timed_mutex::do_lock(cv_state&)
 {
     int res = 0;
     while (m_locked)
diff --git a/src/once.cpp b/src/once.cpp
index 8eb89521..ac3c443c 100644
--- a/src/once.cpp
+++ b/src/once.cpp
@@ -38,8 +38,8 @@ static void key_init()
 
 static void do_once()
 {
-    once_callback cb = reinterpret_cast<once_callback>(pthread_getspecific(key));
-    (*cb)();
+    once_callback* cb = reinterpret_cast<once_callback>(pthread_getspecific(key));
+    (**cb)();
 }
 
 }
@@ -85,8 +85,8 @@ void call_once(void (*func)(), once_flag& flag)
 	}
 #elif defined(BOOST_HAS_PTHREADS)
     pthread_once(&once, &key_init);
-    pthread_setspecific(key, func);
-	pthread_once(&flag, do_once);
+    pthread_setspecific(key, &func);
+    pthread_once(&flag, do_once);
 #endif
 }
 
diff --git a/src/timeconv.inl b/src/timeconv.inl
index 3cd66db9..55e6d64e 100644
--- a/src/timeconv.inl
+++ b/src/timeconv.inl
@@ -23,7 +23,7 @@ namespace {
         xt.sec += (milliseconds / MILLISECONDS_PER_SECOND);
         xt.nsec += ((milliseconds % MILLISECONDS_PER_SECOND) * NANOSECONDS_PER_MILLISECOND);
 
-        if (xt.nsec > NANOSECONDS_PER_SECOND)
+        if (xt.nsec > static_cast<const int>(NANOSECONDS_PER_SECOND))
         {
             ++xt.sec;
             xt.nsec -= NANOSECONDS_PER_SECOND;