diff --git a/include/common/regex.h b/include/common/regex.h
index bf51a0d..bc86bbd 100644
--- a/include/common/regex.h
+++ b/include/common/regex.h
@@ -38,6 +38,7 @@
 #define ACT_DENY	3	/* deny the request */
 #define ACT_PASS	4	/* pass this header without allowing or denying the request */
 #define ACT_TARPIT	5	/* tarpit the connection matching this request */
+#define ACT_SETBE	6	/* switch the backend */
 
 struct hdr_exp {
     struct hdr_exp *next;