diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 209a623..a60f0e2 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -1,5 +1,3 @@
-#warning usage of non-standard #include <sys/cdefs.h> is deprecated
-
 #undef __P
 #undef __PMT