1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 3e743f2356..255431be2d 100644
--- a/io.c
+++ b/io.c
@@ -7758,7 +7758,7 @@ argf_memsize(const void *ptr)
 static const rb_data_type_t argf_type = {
     "ARGF",
     {argf_mark, argf_free, argf_memsize},
-    NULL, NULL, RUBY_TYPED_FREE_IMMEDIATELY
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
 static inline void