1 files changed, 1 insertions, 1 deletions
diff --git a/passes/opt/opt_const.cc b/passes/opt/opt_const.cc
index e00d5e3b1..1e59f18c1 100644
--- a/passes/opt/opt_const.cc
+++ b/passes/opt/opt_const.cc
@@ -198,7 +198,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
 	SigMap assign_map(module);
 	std::map<RTLIL::SigSpec, RTLIL::SigSpec> invert_map;
 
-	TopoSort<RTLIL::Cell*> cells;
+	TopoSort<RTLIL::Cell*, RTLIL::IdString::compare_ptr_by_name<RTLIL::Cell>> cells;
 	std::map<RTLIL::Cell*, std::set<RTLIL::SigBit>> cell_to_inbit;
 	std::map<RTLIL::SigBit, std::set<RTLIL::Cell*>> outbit_to_cell;