diff --git a/libc/stdio/fileext.h b/libc/stdio/fileext.h
index dc89fff..25b7bda 100644
--- a/libc/stdio/fileext.h
+++ b/libc/stdio/fileext.h
@@ -34,6 +34,8 @@
 
 #include <pthread.h>
 
+__BEGIN_DECLS
+
 /*
  * file extension
  */
@@ -61,4 +63,6 @@
 	_FILEEXT_INIT(f); \
 } while (0)
 
+__END_DECLS
+
 #endif /* _FILEEXT_H_ */