diff --git a/src/factory/ChannelAccessFactory.cpp b/src/factory/ChannelAccessFactory.cpp
index 4b5ca16..0842c3f 100644
--- a/src/factory/ChannelAccessFactory.cpp
+++ b/src/factory/ChannelAccessFactory.cpp
@@ -7,6 +7,7 @@
 #include <map>
 #include <vector>
 
+#include <osiSock.h>
 #include <epicsThread.h>
 
 #include <pv/lock.h>
diff --git a/src/remoteClient/clientContextImpl.cpp b/src/remoteClient/clientContextImpl.cpp
index cbe6dd5..3d75691 100644
--- a/src/remoteClient/clientContextImpl.cpp
+++ b/src/remoteClient/clientContextImpl.cpp
@@ -10,6 +10,7 @@
 #include <queue>
 #include <stdexcept>
 
+#include <osiSock.h>
 #include <pv/lock.h>
 #include <pv/timer.h>
 #include <pv/bitSetUtil.h>