diff --git a/include/trick/MonteCarlo.hh b/include/trick/MonteCarlo.hh
index 5c9d46bf..745d3743 100644
--- a/include/trick/MonteCarlo.hh
+++ b/include/trick/MonteCarlo.hh
@@ -7,16 +7,13 @@
 
 #include <deque>
 #include <vector>
+#include <climits>
 
 #include "trick/MonteVar.hh"
 #include "trick/Executive.hh"
 #include "trick/RemoteShell.hh"
 #include "trick/tc.h"
 
-#ifndef HOST_NAME_MAX
-#define HOST_NAME_MAX 128
-#endif
-
 namespace Trick {
 
     /**
diff --git a/trick_source/sim_services/MonteCarlo/MonteCarlo.cpp b/trick_source/sim_services/MonteCarlo/MonteCarlo.cpp
index e367d4a3..05809a59 100644
--- a/trick_source/sim_services/MonteCarlo/MonteCarlo.cpp
+++ b/trick_source/sim_services/MonteCarlo/MonteCarlo.cpp
@@ -22,8 +22,8 @@ Trick::MonteCarlo::MonteCarlo() :
 
     slaves_head = NULL;
 
-    char hostname[HOST_NAME_MAX + 1];
-    gethostname(hostname, HOST_NAME_MAX);
+    char hostname[_POSIX_HOST_NAME_MAX + 1];
+    gethostname(hostname, _POSIX_HOST_NAME_MAX);
     machine_name = hostname;
 
     memset(&listen_device, 0, sizeof(TCDevice)) ;
diff --git a/trick_source/sim_services/MonteCarlo/MonteCarlo_receive_slave_results.cpp b/trick_source/sim_services/MonteCarlo/MonteCarlo_receive_slave_results.cpp
index fa1e7017..22c8b417 100644
--- a/trick_source/sim_services/MonteCarlo/MonteCarlo_receive_slave_results.cpp
+++ b/trick_source/sim_services/MonteCarlo/MonteCarlo_receive_slave_results.cpp
@@ -131,7 +131,7 @@ void Trick::MonteCarlo::read_slave_port(Trick::MonteSlave *curr_slave) {
 
 void Trick::MonteCarlo::read_machine_name(Trick::MonteSlave *curr_slave) {
     int num_bytes;
-    char slave_name[HOST_NAME_MAX];
+    char slave_name[_POSIX_HOST_NAME_MAX];
 
     tc_read(&connection_device, (char *)&num_bytes, (int)sizeof(num_bytes));
     num_bytes = ntohl(num_bytes) ;
diff --git a/trick_source/sim_services/MonteCarlo/MonteCarlo_slave_init.cpp b/trick_source/sim_services/MonteCarlo/MonteCarlo_slave_init.cpp
index 70f235ca..248858d8 100644
--- a/trick_source/sim_services/MonteCarlo/MonteCarlo_slave_init.cpp
+++ b/trick_source/sim_services/MonteCarlo/MonteCarlo_slave_init.cpp
@@ -51,7 +51,7 @@ int Trick::MonteCarlo::slave_init() {
     int id = htonl(slave_id);
     tc_write(&connection_device, (char *)&id, (int)sizeof(id));
 
-    char hostname[HOST_NAME_MAX];
+    char hostname[_POSIX_HOST_NAME_MAX];
     gethostname(hostname, sizeof(hostname)-1);
 
     int num_bytes = htonl(strlen(hostname));