diff --git a/libc/include/sys/epoll.h b/libc/include/sys/epoll.h
index 1478caa..decdb46 100644
--- a/libc/include/sys/epoll.h
+++ b/libc/include/sys/epoll.h
@@ -28,6 +28,10 @@
 #ifndef _SYS_EPOLL_H_
 #define _SYS_EPOLL_H_
 
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
 #define EPOLLIN          0x00000001
 #define EPOLLPRI         0x00000002
 #define EPOLLOUT         0x00000004
@@ -62,5 +66,7 @@
 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
 int epoll_wait(int epfd, struct epoll_event *events, int max, int timeout);
 
+__END_DECLS
+
 #endif  /* _SYS_EPOLL_H_ */
 
diff --git a/libc/include/sys/system_properties.h b/libc/include/sys/system_properties.h
index 2eb00cd..4fdc944 100644
--- a/libc/include/sys/system_properties.h
+++ b/libc/include/sys/system_properties.h
@@ -29,6 +29,10 @@
 #ifndef _INCLUDE_SYS_SYSTEM_PROPERTIES_H
 #define _INCLUDE_SYS_SYSTEM_PROPERTIES_H
 
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
 typedef struct prop_info prop_info;
 
 #define PROP_NAME_MAX   32
@@ -76,4 +80,6 @@
 */ 
 const prop_info *__system_property_find_nth(unsigned n);
 
+__END_DECLS
+
 #endif