Remove unneeded RUBY_FUNC_EXPORTED

1 files changed, 1 insertions, 1 deletions

diff --git a/io.c b/io.c
index 94e6b50656..b4488170ea 100644
--- a/io.c
+++ b/io.c
@@ -5622,7 +5622,7 @@ rb_io_fptr_finalize(rb_io_t *fptr)
 }
 #define rb_io_fptr_finalize(fptr) rb_io_fptr_finalize_internal(fptr)
 
-RUBY_FUNC_EXPORTED size_t
+size_t
 rb_io_memsize(const rb_io_t *fptr)
 {
     size_t size = sizeof(rb_io_t);