1 files changed, 1 insertions, 1 deletions
diff --git a/proc.c b/proc.c
index dd481870ae..638f22cb80 100644
--- a/proc.c
+++ b/proc.c
@@ -1662,7 +1662,7 @@ rb_mod_define_method(int argc, VALUE *argv, VALUE mod)
 	GetProcPtr(body, proc);
 	if (BUILTIN_TYPE(proc->block.iseq) != T_NODE) {
 	    proc->block.iseq->defined_method_id = id;
-	    OBJ_WRITE(proc->block.iseq->self, &proc->block.iseq->klass, mod);
+	    RB_OBJ_WRITE(proc->block.iseq->self, &proc->block.iseq->klass, mod);
 	    proc->is_lambda = TRUE;
 	    proc->is_from_method = TRUE;
 	    proc->block.klass = mod;