diff --git a/src/include/86box/chipset.h b/src/include/86box/chipset.h
index 95440a172..4aa3ee3e9 100644
--- a/src/include/86box/chipset.h
+++ b/src/include/86box/chipset.h
@@ -174,6 +174,8 @@ extern const device_t vlsi_scamp_device;
 extern const device_t wd76c10_device;
 
 /* Miscellaneous Hardware */
+extern const device_t nec_mate_unk_device;
+
 extern const device_t phoenix_486_jumper_device;
 extern const device_t phoenix_486_jumper_pci_device;