diff --git a/modules/ca/src/client/caProto.h b/modules/ca/src/client/caProto.h
index 1af7ec298..397b1edaf 100644
--- a/modules/ca/src/client/caProto.h
+++ b/modules/ca/src/client/caProto.h
@@ -17,6 +17,9 @@
 #ifndef INC_caProto_H
 #define INC_caProto_H
 
+// Pick up definition of IPPORT_USERRESERVED
+#include <osdSock.h>
+
 #define capStrOf(A) #A
 #define capStrOfX(A) capStrOf ( A )
 
diff --git a/modules/libcom/src/osi/os/RTEMS-kernel/osdSock.h b/modules/libcom/src/osi/os/RTEMS-kernel/osdSock.h
index 49023fe78..c70845d84 100644
--- a/modules/libcom/src/osi/os/RTEMS-kernel/osdSock.h
+++ b/modules/libcom/src/osi/os/RTEMS-kernel/osdSock.h
@@ -37,6 +37,10 @@ int select(int  n,  fd_set  *readfds,  fd_set  *writefds, fd_set *exceptfds, str
 }
 #endif
 
+#ifndef IPPORT_USERRESERVED
+#define IPPORT_USERRESERVED 5000
+#endif 
+
 typedef int                     SOCKET;
 #define INVALID_SOCKET          (-1)
 #define SOCKERRNO               errno