diff --git a/lib/gssapi/gssapi/gssapi.h b/lib/gssapi/gssapi/gssapi.h
index 0a6318a83..8ef28ce2a 100644
--- a/lib/gssapi/gssapi/gssapi.h
+++ b/lib/gssapi/gssapi/gssapi.h
@@ -220,9 +220,19 @@ typedef OM_uint32 gss_qop_t;
 #define GSS_IOV_BUFFER_TYPE_EMPTY 0
 #define GSS_IOV_BUFFER_TYPE_DATA 1
 #define GSS_IOV_BUFFER_TYPE_HEADER 2
+#define GSS_IOV_BUFFER_TYPE_MECH_PARAMS 3
+
 #define GSS_IOV_BUFFER_TYPE_TRAILER 7
 #define GSS_IOV_BUFFER_TYPE_PADDING 9
 #define GSS_IOV_BUFFER_TYPE_STREAM 10
+#define GSS_IOV_BUFFER_TYPE_SIGN_ONLY 11
+
+#define GSS_IOV_BUFFER_TYPE_FLAG_MASK 0xffff0000
+#define GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE 0x00010000
+#define GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATED 0x00020000
+
+#define GSS_IOV_BUFFER_TYPE(_t) ((_t) & ~GSS_IOV_BUFFER_TYPE_FLAG_MASK)
+#define GSS_IOV_BUFFER_FLAGS(_t) ((_t) & GSS_IOV_BUFFER_TYPE_FLAG_MASK)
 
 /*
  * Flags of gss_wrap_iov()/gss_unwrap_iov().