diff --git a/include/types/checks.h b/include/types/checks.h
index 6826ac3..f92f0da 100644
--- a/include/types/checks.h
+++ b/include/types/checks.h
@@ -158,6 +158,7 @@
 };
 
 struct check {
+	struct session *sess;			/* Health check session. */
 	struct xprt_ops *xprt;			/* transport layer operations for health checks */
 	struct conn_stream *cs;			/* conn_stream state for health checks */
 	struct buffer bi, bo;			/* input and output buffers to send/recv check */