diff --git a/site_ansto/hardsup/itc4util.c b/site_ansto/hardsup/itc4util.c
index f56e5a7c..1fa5e538 100644
--- a/site_ansto/hardsup/itc4util.c
+++ b/site_ansto/hardsup/itc4util.c
@@ -45,7 +45,6 @@
 #include <sics.h>
 #include <modriv.h>
 #include <rs232controller.h>
-#include "serialsinq.h"
 #include "itc4util.h"
 /*-------------------------------------------------------------------------*/
 
diff --git a/site_ansto/hardsup/lakeshore340util.c b/site_ansto/hardsup/lakeshore340util.c
index cb5505a3..b1dfaea2 100644
--- a/site_ansto/hardsup/lakeshore340util.c
+++ b/site_ansto/hardsup/lakeshore340util.c
@@ -46,7 +46,6 @@
 #include <sics.h>
 #include <modriv.h>
 #include <rs232controller.h>
-#include "serialsinq.h"
 #include "lakeshore340util.h"
 /*-------------------------------------------------------------------------*/
 
diff --git a/site_ansto/hardsup/lh45util.c b/site_ansto/hardsup/lh45util.c
index 16dc07b2..935c83a7 100644
--- a/site_ansto/hardsup/lh45util.c
+++ b/site_ansto/hardsup/lh45util.c
@@ -46,7 +46,6 @@
 #include <sics.h>
 #include <modriv.h>
 #include <rs232controller.h>
-#include "serialsinq.h"
 #include "lh45util.h"
 /*-------------------------------------------------------------------------*/
 
diff --git a/site_ansto/hardsup/nhq200util.c b/site_ansto/hardsup/nhq200util.c
index 73b418d7..4797bcfb 100644
--- a/site_ansto/hardsup/nhq200util.c
+++ b/site_ansto/hardsup/nhq200util.c
@@ -48,7 +48,6 @@
 #include <sics.h>
 #include <modriv.h>
 #include <rs232controller.h>
-#include "serialsinq.h"
 #include "nhq200util.h"
 /*-------------------------------------------------------------------------*/