diff --git a/ssl/dtls1.h b/ssl/dtls1.h
index 6548a98f03..1438b25131 100644
--- a/ssl/dtls1.h
+++ b/ssl/dtls1.h
@@ -68,6 +68,7 @@ extern "C" {
 #endif
 
 #define DTLS1_VERSION			0xFEFF
+#define DTLS1_BAD_VER			0x0100
 
 #if 0
 /* this alert description is not specified anywhere... */