diff --git a/lib/asn1/lex.l b/lib/asn1/lex.l
index 14908d97d..136723fd7 100644
--- a/lib/asn1/lex.l
+++ b/lib/asn1/lex.l
@@ -44,6 +44,7 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#undef ECHO
 #include "symbol.h"
 #include "parse.h"
 #include "lex.h"