1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 91ab2d8c93..33b609e915 100644
--- a/io.c
+++ b/io.c
@@ -590,7 +590,7 @@ rb_io_get_io(VALUE io)
     return rb_convert_type(io, T_FILE, "IO", "to_io");
 }
 
-static VALUE
+VALUE
 rb_io_check_io(VALUE io)
 {
     return rb_check_convert_type(io, T_FILE, "IO", "to_io");