diff --git a/passes/sat/sim.cc b/passes/sat/sim.cc
index eb3f39480..00b144037 100644
--- a/passes/sat/sim.cc
+++ b/passes/sat/sim.cc
@@ -1475,7 +1475,7 @@ struct SimWorker : SimShared
 		fst = new FstData(sim_filename);
 		timescale = fst->getTimescaleString();
 		if (scope.empty()) {
-			scopes = fst->autoScope(topmod);
+			std::vector<std::string> scopes = fst->autoScope(topmod);
 			if (scopes.empty()) {
 				log_error("No scope found for module '%s'. Please specify -scope explicitly.\n", 
 					RTLIL::unescape_id(topmod->name).c_str());
diff --git a/passes/silimate/reg_rename.cc b/passes/silimate/reg_rename.cc
index 05e5200fb..e5c7ffca2 100644
--- a/passes/silimate/reg_rename.cc
+++ b/passes/silimate/reg_rename.cc
@@ -200,7 +200,7 @@ struct RegRenamePass : public Pass {
 			try {
 				FstData fst(vcd_filename);
 				if (scope.empty()) {
-					scopes = fst->autoScope(topmod);
+					std::vector<std::string> scopes = fst.autoScope(topmod);
 					if (scopes.empty()) {
 						log_error("No scope found for module '%s'. Please specify -scope explicitly.\n", 
 							RTLIL::unescape_id(topmod->name).c_str());