1 files changed, 1 insertions, 0 deletions
diff --git a/io.h b/io.h
index 73acbd7812..ddb49961dc 100644
--- a/io.h
+++ b/io.h
@@ -54,5 +54,6 @@ void io_writable _((OpenFile *));
 void io_readable _((OpenFile *));
 void io_fptr_finalize _((OpenFile *));
 void io_unbuffered _((OpenFile *));
+void io_check_closed _((OpenFile *));
 
 #endif