1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 0984fdfe02..465b3d0a93 100644
--- a/io.c
+++ b/io.c
@@ -1139,7 +1139,7 @@ rb_io_closed(io)
     return (fptr->f || fptr->f2)?Qfalse:Qtrue;
 }
 
-VALUE
+static VALUE
 rb_io_close_read(io)
     VALUE io;
 {