diff --git a/sys/compat/linuxkpi/common/include/linux/kernel.h b/sys/compat/linuxkpi/common/include/linux/kernel.h
--- a/sys/compat/linuxkpi/common/include/linux/kernel.h
+++ b/sys/compat/linuxkpi/common/include/linux/kernel.h
@@ -251,6 +251,8 @@
 	log(LOG_CRIT, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_err(fmt, ...) \
 	log(LOG_ERR, pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_err_once(fmt, ...) \
+	log_once(LOG_ERR, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_warning(fmt, ...) \
 	log(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_warn(...) \