diff --git a/include/types/action.h b/include/types/action.h
index 0367ea9..6c5fccf 100644
--- a/include/types/action.h
+++ b/include/types/action.h
@@ -108,6 +108,13 @@
 	struct applet applet;                  /* used for the applet registration. */
 	union {
 		struct {
+			struct sample_expr *expr;
+			char *varname;
+			char *resolvers_id;
+			struct dns_resolvers *resolvers;
+			struct dns_options dns_opts;
+		} dns;                        /* dns resolution */
+		struct {
 			char *realm;
 		} auth;                        /* arg used by "auth" */
 		struct {