diff --git a/include/types/checks.h b/include/types/checks.h
index f92f0da..b980faa 100644
--- a/include/types/checks.h
+++ b/include/types/checks.h
@@ -159,6 +159,7 @@
 
 struct check {
 	struct session *sess;			/* Health check session. */
+	struct vars vars;			/* Health check dynamic variables. */
 	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 */