diff --git a/Adapter.hxx b/Adapter.hxx
index 2a2477f..2b8b054 100644
--- a/Adapter.hxx
+++ b/Adapter.hxx
@@ -8,6 +8,7 @@
 #include "locked_queue.hh"
 #include <cassert>
 #include "pEpLog.hh"
+#include <atomic>
 
 namespace pEp {
     namespace Adapter {
diff --git a/Semaphore.hh b/Semaphore.hh
index 268afa1..a9c0593 100644
--- a/Semaphore.hh
+++ b/Semaphore.hh
@@ -6,6 +6,7 @@
 
 #include <mutex>
 #include <condition_variable>
+#include <atomic>
 
 namespace pEp {
     class Semaphore {
diff --git a/pEpLog.cc b/pEpLog.cc
index affd0e5..cfaa083 100644
--- a/pEpLog.cc
+++ b/pEpLog.cc
@@ -4,8 +4,10 @@
 #include "pEpLog.hh"
 #include <iostream>
 #include <sstream>
+#include <mutex>
 #include <atomic>
 
+
 namespace pEp {
 namespace Adapter {
 namespace pEpLog {