diff --git a/sys/compat/linuxkpi/common/include/linux/ratelimit.h b/sys/compat/linuxkpi/common/include/linux/ratelimit.h
--- a/sys/compat/linuxkpi/common/include/linux/ratelimit.h
+++ b/sys/compat/linuxkpi/common/include/linux/ratelimit.h
@@ -14,4 +14,11 @@
 #define ratelimit_state_init(x, y, z)
 #define ratelimit_set_flags(x, y)
 
+#define	WARN_RATELIMIT(condition, ...) ({		\
+	bool __ret_warn_on = (condition);		\
+	if (unlikely(__ret_warn_on))			\
+		pr_warn_ratelimited(__VA_ARGS__);	\
+	unlikely(__ret_warn_on);			\
+})
+
 #endif