diff --git a/src/include/os/vxWorks/osiSock.h b/src/include/os/vxWorks/osiSock.h
index 352895c27..1f91219d5 100644
--- a/src/include/os/vxWorks/osiSock.h
+++ b/src/include/os/vxWorks/osiSock.h
@@ -15,6 +15,7 @@ extern "C" {
 #include <sys/times.h>
 #include <sys/socket.h>
 #include <sockLib.h>
+#include <ioLib.h>
 #include <sys/ioctl.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
diff --git a/src/libCom/osi/os/vxWorks/osdSock.h b/src/libCom/osi/os/vxWorks/osdSock.h
index 352895c27..1f91219d5 100644
--- a/src/libCom/osi/os/vxWorks/osdSock.h
+++ b/src/libCom/osi/os/vxWorks/osdSock.h
@@ -15,6 +15,7 @@ extern "C" {
 #include <sys/times.h>
 #include <sys/socket.h>
 #include <sockLib.h>
+#include <ioLib.h>
 #include <sys/ioctl.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>