diff --git a/src/include/86box/sound.h b/src/include/86box/sound.h
index b69785353..6037a6039 100644
--- a/src/include/86box/sound.h
+++ b/src/include/86box/sound.h
@@ -196,6 +196,7 @@ extern const device_t cs4238b_device;
 /* ESS Technology */
 extern const device_t ess_688_device;
 extern const device_t ess_ess0100_pnp_device;
+extern const device_t ess_ess0968_pnp_688_device;
 extern const device_t ess_1688_device;
 extern const device_t ess_ess0102_pnp_device;
 extern const device_t ess_ess0968_pnp_device;