diff --git a/src/MultiPlayer/multiplaymgr.cxx b/src/MultiPlayer/multiplaymgr.cxx
index 5683a58d9..c94ea8466 100644
--- a/src/MultiPlayer/multiplaymgr.cxx
+++ b/src/MultiPlayer/multiplaymgr.cxx
@@ -34,6 +34,7 @@
 #include <iostream>
 #include <algorithm>
 #include <cstring>
+#include <errno.h>
 #include <osg/Math>             // isNaN
 
 #include <simgear/misc/stdint.hxx>
diff --git a/src/Network/props.cxx b/src/Network/props.cxx
index 10befcab8..ac1b6ee97 100644
--- a/src/Network/props.cxx
+++ b/src/Network/props.cxx
@@ -36,6 +36,7 @@
 
 #include <sstream>
 #include <iostream>
+#include <errno.h>
 
 #include <Main/globals.hxx>
 #include <Main/viewmgr.hxx>