diff --git a/include/Makefile.am b/include/Makefile.am
index a552026..3a5a016 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,6 +1,5 @@
 noinst_HEADERS =
 noinst_HEADERS += machine/endian.h
-noinst_HEADERS += sys/cdefs.h
 noinst_HEADERS += sys/queue.h
 noinst_HEADERS += sys/socket.h
 noinst_HEADERS += sys/types.h
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
deleted file mode 100644
index 3dec43d..0000000
--- a/include/sys/cdefs.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Public domain
- * sys/cdefs.h compatibility shim
- */
-
-#include_next <sys/cdefs.h>
-
-#ifndef LIBCOMPAT_SYS_CDEFS_H
-#define LIBCOMPAT_SYS_CDEFS_H
-
-#if !defined(HAVE_ATTRIBUTE__DEAD) && !defined(__dead)
-#define __dead          __attribute__((__noreturn__))
-#define __pure          __attribute__((__const__))
-#endif
-
-#endif
diff --git a/include/sys/types.h b/include/sys/types.h
index 56aef0b..86821c7 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -14,6 +14,10 @@
 #include <_bsd_types.h>
 #endif
 
+#if !defined(HAVE_ATTRIBUTE__DEAD) && !defined(__dead)
+#define __dead		__attribute__((__noreturn__))
+#endif
+
 #if !defined(HAVE_ATTRIBUTE__BOUNDED__) && !defined(__bounded__)
 # define __bounded__(x, y, z)
 #endif