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-rw-r--r--include/ruby/ruby.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 05c53fb838..9af062ec94 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -740,6 +740,9 @@ VALUE rb_obj_setup(VALUE obj, VALUE klass, VALUE type);
#ifndef RGENGC_WB_PROTECTED_BIGNUM
#define RGENGC_WB_PROTECTED_BIGNUM 1
#endif
+#ifndef RGENGC_WB_PROTECTED_NODE_CREF
+#define RGENGC_WB_PROTECTED_NODE_CREF 1
+#endif
struct RBasic {
VALUE flags;