diff --git a/src/ca/vxWorks_depen.c b/src/ca/vxWorks_depen.c
index df1af7e84..409b57893 100644
--- a/src/ca/vxWorks_depen.c
+++ b/src/ca/vxWorks_depen.c
@@ -42,8 +42,6 @@ LOCAL int cac_os_depen_exit_tid (struct ca_static *pcas, int tid);
 LOCAL int cac_add_task_variable (struct ca_static *ca_temp);
 LOCAL void deleteCallBack(CALLBACK *pcb);
 
-#define USEC_PER_SEC 1000000
-
 
 /*
  * cac_gettimeval()