diff --git a/simgear/io/sg_netBuffer.cxx b/simgear/io/sg_netBuffer.cxx
index 126b4e29..2bbf50b6 100644
--- a/simgear/io/sg_netBuffer.cxx
+++ b/simgear/io/sg_netBuffer.cxx
@@ -25,6 +25,9 @@
 
 #include "sg_netBuffer.hxx"
 
+#include <cassert>
+#include <cstring>
+
 #include <simgear/debug/logstream.hxx>
 
 namespace simgear {
diff --git a/simgear/io/sg_netChannel.cxx b/simgear/io/sg_netChannel.cxx
index e02f073b..c6502565 100644
--- a/simgear/io/sg_netChannel.cxx
+++ b/simgear/io/sg_netChannel.cxx
@@ -32,6 +32,8 @@
 #include "sg_netChannel.hxx"
 
 #include <memory>
+#include <cassert>
+#include <cstring>
 
 #include <simgear/debug/logstream.hxx>