diff --git a/include/Makefile.am b/include/Makefile.am
index 98920b4..9f42f05 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -29,7 +29,6 @@ noinst_HEADERS += compat/netinet/in.h
 noinst_HEADERS += compat/netinet/ip.h
 noinst_HEADERS += compat/netinet/tcp.h
 
-noinst_HEADERS += compat/sys/cdefs.h
 noinst_HEADERS += compat/sys/ioctl.h
 noinst_HEADERS += compat/sys/mman.h
 noinst_HEADERS += compat/sys/param.h
diff --git a/include/compat/sys/types.h b/include/compat/sys/types.h
index 4833816..2065f5f 100644
--- a/include/compat/sys/types.h
+++ b/include/compat/sys/types.h
@@ -18,8 +18,6 @@
 
 #include <stdint.h>
 
-#include <sys/cdefs.h>
-
 #ifdef __MINGW32__
 #include <_bsd_types.h>
 #endif