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-rw-r--r--io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 8fbb6cb..4595282 100644
--- a/io.c
+++ b/io.c
@@ -3535,7 +3535,7 @@ rb_io_fptr_finalize(rb_io_t *fptr)
size_t rb_econv_memsize(rb_econv_t *);
-size_t
+RUBY_FUNC_EXPORTED size_t
rb_io_memsize(const rb_io_t *fptr)
{
size_t size = sizeof(rb_io_t);