diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index 337af7fd7..f1c4a1d3b 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -175,16 +175,12 @@ bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool flag_check
 			{
 				filename = dir + "/" + RTLIL::unescape_id(cell->type) + ".v";
 				if (check_file_exists(filename)) {
-					std::vector<std::string> args;
-					args.push_back(filename);
 					Frontend::frontend_call(design, NULL, filename, "verilog");
 					goto loaded_module;
 				}
 
 				filename = dir + "/" + RTLIL::unescape_id(cell->type) + ".il";
 				if (check_file_exists(filename)) {
-					std::vector<std::string> args;
-					args.push_back(filename);
 					Frontend::frontend_call(design, NULL, filename, "ilang");
 					goto loaded_module;
 				}