diff --git a/src/engine.cpp b/src/engine.cpp
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -490,11 +490,12 @@ void EngineOverrideManager::ResetToDefau
 	this->clear();
 	for (VehicleType type = VEH_TRAIN; type <= VEH_AIRCRAFT; type++) {
 		for (uint internal_id = 0; internal_id < _engine_counts[type]; internal_id++) {
-			EngineIDMapping *eid = this->Append();
-			eid->type            = type;
-			eid->grfid           = INVALID_GRFID;
-			eid->internal_id     = internal_id;
-			eid->substitute_id   = internal_id;
+			/*C++17: EngineIDMapping &eid = */ this->emplace_back();
+			EngineIDMapping &eid = this->back();
+			eid.type            = type;
+			eid.grfid           = INVALID_GRFID;
+			eid.internal_id     = internal_id;
+			eid.substitute_id   = internal_id;
 		}
 	}
 }