diff --git a/include/proto/checks.h b/include/proto/checks.h
index 37681f1..d949175 100644
--- a/include/proto/checks.h
+++ b/include/proto/checks.h
@@ -26,6 +26,8 @@
 #include <common/config.h>
 #include <types/mailers.h>
 
+#include <types/action.h>
+
 const char *get_check_status_description(short check_status);
 const char *get_check_status_info(short check_status);
 void __health_adjust(struct server *s, short status);
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 */
diff --git a/include/types/vars.h b/include/types/vars.h
index 9b166e9..a72469f 100644
--- a/include/types/vars.h
+++ b/include/types/vars.h
@@ -12,6 +12,7 @@
 	SCOPE_REQ,
 	SCOPE_RES,
 	SCOPE_PROC,
+	SCOPE_CHECK,
 };
 
 struct vars {