diff --git a/modules/libcom/src/as/asLibRoutines.c b/modules/libcom/src/as/asLibRoutines.c
index fce4a41c2..cb00ca6c7 100644
--- a/modules/libcom/src/as/asLibRoutines.c
+++ b/modules/libcom/src/as/asLibRoutines.c
@@ -29,6 +29,8 @@
 #include "postfix.h"
 #include "asLib.h"
 
+#undef ECHO /* from termios.h */
+
 int asCheckClientIP;
 
 static epicsMutexId asLock;