diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index fab87cf..761ba5a 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -461,10 +461,10 @@ libevdev_set_fd(struct libevdev* dev, int fd)
 
 	dev->fd = fd;
 
-	/* devices with ABS_MT_SLOT - 1 aren't MT devices,
+	/* devices with ABS_RESERVED aren't MT devices,
 	   see the documentation for multitouch-related
 	   functions for more details */
-	if (!libevdev_has_event_code(dev, EV_ABS, ABS_MT_SLOT - 1) &&
+	if (!libevdev_has_event_code(dev, EV_ABS, ABS_RESERVED) &&
 	    libevdev_has_event_code(dev, EV_ABS, ABS_MT_SLOT)) {
 		const struct input_absinfo *abs_info;
 
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index f0f34bb..198b684 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -688,7 +688,7 @@ extern "C" {
  * meaning, matching the axis names in linux/input.h. Some devices merely
  * export a number of axes beyond the available axis list. For those
  * devices, the multitouch information is invalid. Specifically, if a device
- * provides the ABS_MT_SLOT axis AND also the (ABS_MT_SLOT - 1) axis, the
+ * provides the ABS_MT_SLOT axis AND also the ABS_RESERVED axis, the
  * device is not treated as multitouch device. No slot information is
  * available and the ABS_MT axis range for these devices is treated as all
  * other EV_ABS axes.