diff --git a/src/libeis-client.c b/src/libeis-client.c
index 56a4477..3ed7c1f 100644
--- a/src/libeis-client.c
+++ b/src/libeis-client.c
@@ -694,6 +694,7 @@ eis_client_new(struct eis *eis, int fd)
 
 	client->interface_versions = (struct eis_client_interface_versions){
 		.ei_connection = VERSION_V(1),
+		.ei_connection_setup = VERSION_V(1),
 		.ei_callback = VERSION_V(1),
 		.ei_seat = VERSION_V(1),
 	};
diff --git a/src/libeis-client.h b/src/libeis-client.h
index 45f12cb..fef126e 100644
--- a/src/libeis-client.h
+++ b/src/libeis-client.h
@@ -39,6 +39,7 @@ enum eis_client_state {
 
 struct eis_client_interface_versions {
 	uint32_t ei_connection;
+	uint32_t ei_connection_setup;
 	uint32_t ei_callback;
 	uint32_t ei_seat;
 };
diff --git a/src/libeis-connection-setup.c b/src/libeis-connection-setup.c
index 1fd4a64..fd3da05 100644
--- a/src/libeis-connection-setup.c
+++ b/src/libeis-connection-setup.c
@@ -132,6 +132,7 @@ client_msg_interface(struct eis_connection_setup *setup, const char *name, uint3
 }
 		VERSION_ENTRY(ei_callback),
 		VERSION_ENTRY(ei_connection),
+		VERSION_ENTRY(ei_connection_setup),
 		VERSION_ENTRY(ei_seat),
 #undef VERSION_ENTRY
 	};
@@ -178,6 +179,7 @@ eis_connection_setup_new(struct eis_client *client, uint32_t new_id,
 	setup->proto_object.id = new_id;
 	setup->proto_object.implementation = setup;
 	setup->proto_object.interface = &eis_connection_setup_proto_interface;
+	setup->proto_object.version = versions->ei_connection_setup;
 	list_init(&setup->proto_object.link);
 
 	setup->version = VERSION_V(1); /* our ei-connection-setup version */