diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index 739b701f8..c40af88aa 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -121,6 +121,12 @@ namespace RTLIL
 			global_id_index_[global_id_storage_.at(idx)] = idx;
 			global_refcount_storage_.at(idx)++;
 
+			// Avoid Create->Delete->Create pattern
+			static IdString last_created_id;
+			put_reference(last_created_id.index_);
+			last_created_id.index_ = idx;
+			get_reference(last_created_id.index_);
+
 			if (yosys_xtrace) {
 				log("#X# New IdString '%s' with index %d.\n", p, idx);
 				log_backtrace("-X- ", yosys_xtrace-1);