diff --git a/newlib/libc/include/sys/cdefs.h b/newlib/libc/include/sys/cdefs.h
index 679425a83..fa1692c0d 100644
--- a/newlib/libc/include/sys/cdefs.h
+++ b/newlib/libc/include/sys/cdefs.h
@@ -634,6 +634,13 @@
 #if !(defined(__clang__) && __has_feature(nullability))
 #define	_Nonnull
 #define	_Nullable
+#define	_Null_unspecified
+#define	__NULLABILITY_PRAGMA_PUSH
+#define	__NULLABILITY_PRAGMA_POP
+#else
+#define	__NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push")	\
+	_Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
+#define	__NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
 #endif
 
 /*