diff --git a/test-tool/iscsi-test.h b/test-tool/iscsi-test.h
index ab95d1e..9b76079 100644
--- a/test-tool/iscsi-test.h
+++ b/test-tool/iscsi-test.h
@@ -25,6 +25,8 @@ struct iscsi_async_state {
 	int finished;
 };
 void wait_until_test_finished(struct iscsi_context *iscsi, struct iscsi_async_state *test_state);
+
+struct iscsi_pdu;
 void (*local_iscsi_queue_pdu)(struct iscsi_context *iscsi, struct iscsi_pdu *pdu);
 
 int T0100_read10_simple(const char *initiator, const char *url, int data_loss, int show_info);