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Diffstat (limited to 'ext/objspace/objspace.c')
-rw-r--r--ext/objspace/objspace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index b557cc9ab32..65fa201d463 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -33,7 +33,7 @@
size_t rb_str_memsize(VALUE);
size_t rb_ary_memsize(VALUE);
-size_t rb_io_memsize(rb_io_t *);
+size_t rb_io_memsize(const rb_io_t *);
size_t rb_generic_ivar_memsize(VALUE);
size_t rb_objspace_data_type_memsize(VALUE obj);