1 files changed, 1 insertions, 0 deletions
diff --git a/vm.c b/vm.c
index bc57caf16a..c618b796cc 100644
--- a/vm.c
+++ b/vm.c
@@ -995,6 +995,7 @@ collect_outer_variable_names(ID id, VALUE val, void *ptr)
 }
 
 VALUE rb_ractor_error_class(void);
+VALUE rb_ractor_make_shareable(VALUE obj);
 
 static const rb_env_t *
 env_copy(const VALUE *src_ep, VALUE read_only_variables)