diff --git a/include/types/spoe.h b/include/types/spoe.h
index a6b0ffc..b65bc7a 100644
--- a/include/types/spoe.h
+++ b/include/types/spoe.h
@@ -294,6 +294,8 @@
 
 /* Frame Types sent by HAProxy and by agents */
 enum spoe_frame_type {
+	SPOE_FRM_T_UNSET = 0,
+
 	/* Frames sent by HAProxy */
 	SPOE_FRM_T_HAPROXY_HELLO = 1,
 	SPOE_FRM_T_HAPROXY_DISCON,