diff --git a/passes/cmds/setundef.cc b/passes/cmds/setundef.cc
index e592d5be0..792b9b12c 100644
--- a/passes/cmds/setundef.cc
+++ b/passes/cmds/setundef.cc
@@ -506,7 +506,7 @@ struct SetundefPass : public Pass {
 				if (!cell->get_bool_attribute(ID::xprop_decoder))
 					cell->rewrite_sigspecs(worker);
 			for (auto &it : module->selected_processes())
-				it.second->rewrite_sigspecs(worker);
+				it->rewrite_sigspecs(worker);
 			for (auto &it : module->connections_) {
 				SigSpec lhs = it.first;
 				bool selected = false;