diff --git a/lib/birdlib.h b/lib/birdlib.h
index 4adc42cd..caa26b94 100644
--- a/lib/birdlib.h
+++ b/lib/birdlib.h
@@ -72,6 +72,7 @@ static inline int u64_cmp(u64 i1, u64 i2)
 #define NORET __attribute__((noreturn))
 #define UNUSED __attribute__((unused))
 #define PACKED __attribute__((packed))
+#define NONNULL(...) __attribute__((nonnull((__VA_ARGS__))))
 
 #ifndef HAVE_THREAD_LOCAL
 #define _Thread_local