diff --git a/site_ansto/hardsup/sct_usbtmcprot.c b/site_ansto/hardsup/sct_usbtmcprot.c
index 3e16646d..66e56b9c 100644
--- a/site_ansto/hardsup/sct_usbtmcprot.c
+++ b/site_ansto/hardsup/sct_usbtmcprot.c
@@ -1,7 +1,7 @@
 /** @file USBTMC protocol handler for script-context based controllers.
 *
 */
-#include <stropts.h> 
+#include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>