diff --git a/src/capwap/cw_log.h b/src/capwap/cw_log.h
index ca60aefe..af25f1f1 100644
--- a/src/capwap/cw_log.h
+++ b/src/capwap/cw_log.h
@@ -42,6 +42,7 @@
 /* DTLS debugs */
 #define DBG_DTLS			0x10000000
 #define DBG_DTLS_DETAIL			0x20000000
+#define DBG_DTLS_BIO			0x40000000
 
 #define DBG_ALL				0xffffffff