diff --git a/sys/compat/linuxkpi/common/include/linux/ktime.h b/sys/compat/linuxkpi/common/include/linux/ktime.h
--- a/sys/compat/linuxkpi/common/include/linux/ktime.h
+++ b/sys/compat/linuxkpi/common/include/linux/ktime.h
@@ -262,4 +262,13 @@
 	return (ktime_to_ns(timespec_to_ktime(ts)));
 }
 
+static inline uint64_t
+ktime_get_raw_fast_ns(void)
+{
+	struct timespec ts;
+
+	getnanouptime(&ts);
+	return (ktime_to_ns(timespec_to_ktime(ts)));
+}
+
 #endif /* _LINUXKPI_LINUX_KTIME_H */