diff --git a/sys/dev/evdev/uinput.c b/sys/dev/evdev/uinput.c
index 3ed2e13b2053..4b62e22a284b 100644
--- a/sys/dev/evdev/uinput.c
+++ b/sys/dev/evdev/uinput.c
@@ -604,6 +604,15 @@ uinput_ioctl_sub(struct uinput_cdev_state *state, u_long cmd, caddr_t data)
 		evdev_set_phys(state->ucs_evdev, buf);
 		return (0);
 
+	case UI_SET_BSDUNIQ:
+		if (state->ucs_state == UINPUT_RUNNING)
+			return (EINVAL);
+		ret = copyinstr(*(void **)data, buf, sizeof(buf), NULL);
+		if (ret != 0)
+			return (ret);
+		evdev_set_serial(state->ucs_evdev, buf);
+		return (0);
+
 	case UI_SET_SWBIT:
 		if (state->ucs_state == UINPUT_RUNNING ||
 		    intdata > SW_MAX || intdata < 0)
diff --git a/sys/dev/evdev/uinput.h b/sys/dev/evdev/uinput.h
index dd4b0a82c1d3..d15b8945f460 100644
--- a/sys/dev/evdev/uinput.h
+++ b/sys/dev/evdev/uinput.h
@@ -90,6 +90,13 @@ struct uinput_abs_setup {
 #define UI_BEGIN_FF_ERASE	_IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
 #define UI_END_FF_ERASE		_IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)
 
+/*
+ * FreeBSD specific. Set unique identifier of input device.
+ * Name and magic are chosen to reduce chances of clashing
+ * with possible future Linux extensions.
+ */
+#define UI_SET_BSDUNIQ		_IO(UINPUT_IOCTL_BASE, 109)
+
 #define EV_UINPUT		0x0101
 #define UI_FF_UPLOAD		1
 #define UI_FF_ERASE		2