diff --git a/src/ptlib/unix/channel.cxx b/src/ptlib/unix/channel.cxx
index 3b17dda..2dcaa18 100644
--- a/src/ptlib/unix/channel.cxx
+++ b/src/ptlib/unix/channel.cxx
@@ -36,7 +36,7 @@
 
 #include <ptlib.h>
 #include <sys/ioctl.h>
-
+#include <sys/uio.h>
 
 #include "../common/pchannel.cxx"