diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 877abba..aba8627 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -847,9 +847,15 @@ libevdev_grab(struct libevdev *dev, int grab)
 {
 	int rc = 0;
 
-	if (grab && !dev->grabbed)
+	if (grab != LIBEVDEV_GRAB && grab != LIBEVDEV_UNGRAB)
+		return -EINVAL;
+
+	if (grab == dev->grabbed)
+		return 0;
+
+	if (grab == LIBEVDEV_GRAB)
 		rc = ioctl(dev->fd, EVIOCGRAB, (void *)1);
-	else if (!grab && dev->grabbed)
+	else if (grab == LIBEVDEV_UNGRAB)
 		rc = ioctl(dev->fd, EVIOCGRAB, (void *)0);
 
 	if (rc == 0)
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index 8feb542..d18bd1f 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -83,6 +83,12 @@ typedef void (*libevdev_log_func_t)(const char *format, va_list args);
  */
 void libevdev_set_log_handler(struct libevdev *dev, libevdev_log_func_t logfunc);
 
+
+enum EvdevGrabModes {
+	LIBEVDEV_GRAB = 3,
+	LIBEVDEV_UNGRAB = 4,
+};
+
 /**
  * Grab or ungrab the device through a kernel EVIOCGRAB. This prevents other
  * clients (including kernel-internal ones such as rfkill) from receiving