diff --git a/site_ansto/motor_dmc2280.c b/site_ansto/motor_dmc2280.c
index 8990e787..20722205 100644
--- a/site_ansto/motor_dmc2280.c
+++ b/site_ansto/motor_dmc2280.c
@@ -917,8 +917,9 @@ static int DMC2280Send(pDMC2280Driv self, char *command) {
  */
 static int DMC2280SendReceive(pDMC2280Driv self, char *cmd, char* reply) {
   int status;
+  int cmd_len = CMDLEN;
 
-  status = AsyncUnitTransact(self->asyncUnit, cmd, strlen(cmd), reply, CMDLEN);
+  status = AsyncUnitTransact(self->asyncUnit, cmd, strlen(cmd), reply, &cmd_len);
 
   if (status != 1) {
     if (self->debug)
@@ -1390,7 +1391,7 @@ static char* state_name(StateFunc func) {
   return "<unknown_state>";
 }
 
-void str_n_cat(char* s1, int len, const char* s2) {
+static void str_n_cat(char* s1, int len, const char* s2) {
   int i = strlen(s1);
   const char* p = s2;
   while (i < len - 3 && *p) {